Body planes and cavities
This page has four parts, in the order you use them. Part 1 is what you need to know. Part 2 says what to do, in plain English. Part 3 shows the work done once on a case that is not yours. Part 4 is your own work and where to turn it in.
Open your materials, follow the steps, then turn in your work.
Identify the body planes and major cavities and the organs each contains.
Part 1 of 4 · Background and definitions▸
💡 Big idea: Radiologists and surgeons name a location by plane and because a plane says which direction a view is cut and a cavity says which region a finding sits in; the terms narrow where to look, and the exact organ or finding still has to be named on its own.
- • The three anatomical planes: (left/right), /coronal (front/back), and (top/bottom).
- • The dorsal contains the cranial and spinal cavities; the ventral cavity contains the thoracic and abdominopelvic cavities.
- • Radiologists and surgeons use plane and terms to say which direction a view is cut and which region a finding sits in; the terms narrow the location and do not name an exact organ or finding on their own.
Name the teaching purpose, the audience, and the privacy conditions before defending reuse.
Radiologists and surgeons name a location by plane and because a plane says which direction a view is cut and a cavity says which region a finding sits in; the terms narrow where to look, and the exact organ or finding still has to be named on its own.
Driving question: A radiology report says a mass sits 'in the ventral , best seen on the plane.' Which organs are in play, and what slice of the body would actually show it?
What you already know: No prior completion is assumed. Use the supplied definitions and two F1 illustrations. Left and right belong to the depicted person; seated students may point on F1 instead of moving.
New idea: Radiologists and surgeons name a location by plane and because a plane says which direction a view is cut and a cavity says which region a finding sits in; the terms narrow where to look, and the exact organ or finding still has to be named on its own.
Visual or model: F1 has two illustrations: planes through a body on the left, and a separate side-view cavity map on the right. Follow their labels on one notebook page: planes with portions, cavities with subdivisions, and an organ in each major cavity. What to notice: Name the plane by what it separates. Place the organ by the cavity it sits in.
- Read your plane notes and find each plane on F1: the slice and the two portions it separates.
- Outline the dorsal and ventral cavities on your diagram and label their subdivisions from F1.
- Place at least one organ from the examples in your notes in each major , in its subdivision.
- Write the three which-plane lines, then date the page and photograph it with every label readable.
Real biomedical example: Distinct worked location model, reference only: an invented label card says section through the cranial . Sagittal separates left and right; cranial is inside the skull and contains the brain. Thus the words identify a plane and region. They supply no image, exact slice level, diagnosis or patient finding. This is not your full diagram and requires no extra response. Source: Anatomical Terminology: planes and body cavities.
What the evidence supports: F1 and your notes, including the organ examples in E2, support the one product: a dated, labeled diagram submitted as one photo.
What it cannot prove: A labeled diagram cannot show a real patient's organs, a mass, or which scan to order.
- • Anatomical position: Standing upright, arms at the sides, palms forward. Every plane and direction word assumes this pose.
- • plane: An imaginary vertical surface that separates left from right; a section is the cut made along it. Midsagittal runs through the .
- • (coronal) plane: An imaginary vertical surface that separates (front) from (back).
- • plane: An imaginary surface that separates (upper) from (lower).
- • Dorsal : The space toward the back that holds the cranial and the spinal cavity.
- • Ventral : The space toward the front that holds the thoracic and the abdominopelvic cavity, separated by the diaphragm.
- • Cranial : Space inside the skull that contains the brain; a dorsal subdivision.
- • Spinal : Canal within the vertebral column that contains the spinal cord; the other dorsal subdivision.
- • Thoracic : Chest space above the diaphragm; the ventral subdivision containing the heart and lungs.
- • Abdominopelvic : Ventral space below the diaphragm, including abdominal and pelvic portions; examples include stomach and intestines.
- • Section: A cut or represented slice along a plane; a diagram is not an actual patient image.
- • Subdivision: A named smaller part within a larger .
- • Diaphragm: The muscle sheet between the thoracic and abdominopelvic cavities.
Use it now: Use F1 for the first question and your notes for the second: which plane separates the front of the body from the back, and which ventral subdivision do your notes place the lungs in? This is thinking practice for the one turn-in named under Turn in, not a second submission.
Go further, optional: The OpenStax and SEER pages add context on planes and cavities. F1 and your notes supply everything the diagram needs.
Your notes on the three planes: each is an imaginary flat surface named by the two portions it separates; a section is the cut made along it. F1 draws all three on one body in anatomical position.
Limit: The notes and figure name planes; they do not say which plane a given scan used. That comes from the image's own label.
F1 has a plane illustration on the left and a separate side-view illustration on the right. A subdivision is a named smaller part of a cavity. Dorsal is toward the back: cranial is inside the skull and holds the brain; spinal is the canal within the vertebral column and holds the spinal cord. Ventral is toward the front. Thoracic is the chest above the diaphragm and holds the heart and lungs. Abdominopelvic is below the diaphragm and includes the stomach and intestines. The diaphragm is the muscle sheet separating the two ventral subdivisions. These four organ pairings are the complete reference for the original matching recovery; no prior notes are needed.
Limit: F1 names no organ; the pairings are reference knowledge. One organ per major is required; an example shows position, not size, function, or disease.
No patient scan, image, or measurement is supplied today; the composite case gives a location in words only. The diagram is a reference drawing, not a finding. Distinct worked location model, reference only: an invented label card says section through the cranial . Sagittal separates left and right; cranial is inside the skull and contains the brain. Thus the words identify a plane and region. They supply no image, exact slice level, diagnosis or patient finding. This is not your full diagram and requires no extra response. No-access route, 25-45 only: keep the official matching task pending. At 25-30 read E2 and locate its four subdivisions on F1. At 30-35 cover the organ examples and match brain, spinal cord, heart and stomach to subdivisions aloud or with brief pencil labels. At 35-40 uncover E2 and check each match against its pairings. Correct a mismatch or mark a verified match. At 40-45 transfer only needed labels to the same notebook diagram and record missing access plus next action: ask the teacher for the enrolled task. No second worksheet is due. If official access works, do the assigned matching instead, not both routes. Neither recovery nor the diagram proves official completion.
Limit: Label planes by the portions they separate and place organs in the your figure shows. A labeled diagram cannot show a real patient's organs, a mass, or which scan to order.
Today's decision · Simulated classroom evidence scenario
Your role: student labeling a planes-and-cavities diagram from F1 and your notes
Decision: A partner put the heart in the dorsal , behind the breastbone, and left the abdominopelvic cavity empty until a scan shows an organ. Decide how your diagram places each organ.
- • Leave the abdominopelvic empty until a scan shows which organ is inside it.
- • Label each plane by the two portions it separates and place every organ in the subdivision your notes list.
- • Put the heart in the dorsal because dorsal means back and the heart sits behind the breastbone.
Response: One photo of your completed, dated notebook diagram, submitted in your section's Wk3 Lab notebook: Body planes and cavities assignment by its posted deadline. The choice discussion is preparation, not another submission. Use it inside the one turn-in named under Turn in; it is not a separate submission.
Claim ceiling: Label planes by the portions they separate and place organs in the your figure shows. A labeled diagram cannot show a real patient's organs, a mass, or which scan to order.
Reason for review: A report locates a finding by and plane; a second reader with the report alone and a planes-and-cavities diagram must say what those words fix and what they leave open.
Context: A composite teaching case, not a real patient. Its whole content is the location language the diagram teaches.
- • A radiology report names a finding in the ventral , best seen on the plane.
- • A reader who has not seen the images uses a planes-and-cavities diagram and the organ examples to say which subdivisions could be in view.
- • The report names a , not an organ or a subdivision.
- • The report names the plane that shows the finding, not its size, depth or cause.
- • The diagram shows the ventral 's two subdivisions; the example organs for each come from your notes, not from the figure.
Measurements: No measurements are supplied. The report gives a location in words, not a size, and this case supplies no image.
Figure finding: Ventral , plane. The organs in view depend on the subdivision, which the report does not name.
Uncertainty: The report does not say which subdivision, which organ, or what the finding is; the diagram cannot supply any of that.
Students often think the dorsal (back) and ventral (front) cavity split the body into a simple back-half and front-half, each holding whatever is near it. The trap: the dorsal is small and specific (only the brain in the cranial cavity and the spinal cord in the spinal cavity), while nearly all the big organs (heart, lungs, stomach, intestines) sit in the ventral cavity, so 'back' does not mean 'everything behind the middle.'
- CER:
- Claim, Evidence, Reasoning: make a claim, back it with evidence, explain your reasoning.
- SOP:
- Standard Operating Procedure, the exact steps to follow (especially in a lab).
- Tracker:
- Your PLTW progress log where you record completed evidence.
- myPLTW:
- The PLTW course site where you do the online activities. Find it in Clever with your Microsoft sign-in, right next to Schoology.
Part 2 of 4 · Directions in plain English▸
2.1 Open your materials
Use the materials named in the first step below. Open lesson resources.
2.2 Start the work
Read the notes on the sagittal, frontal (coronal), and transverse planes.
Show all 5 required steps
- Read the notes on the sagittal, frontal (coronal), and transverse planes.
- Label the dorsal and ventral cavities and their subdivisions on a diagram.
- Complete the PLTW online task matching organs to their cavities.
- List which plane you would use to separate left from right, front from back, and top from bottom.
- Submit your labeled planes-and-cavities diagram.
Lost your place? Interrupted? Check your diagram. No planes labeled yet? Start at step 1 and label sagittal, frontal, and transverse. Planes done but cavities blank? Do step 2, labeling dorsal and ventral and their subdivisions, then finish the organ-matching task.
- 0-8Intro: planes and CT views
- 8-25Notes: three planes and dorsal/ventral subdivisions
- 25-45PLTW online task: match organs to cavities
- 45-62Label planes-and-cavities diagram with organ examples
- 62-75Partner check: quiz each other on plane and names
- 75-80Submit diagram; preview types next class
- • The prior lesson considered medical-image reuse; your completion is unverified. Today supplied references define planes and cavities without a patient image.
- • Medical images are read along named planes. A CT study, for example, is built from slices that can be rebuilt in other planes, so the imaging method alone does not name the plane you are looking at.
- • We are also going to learn which organs live in which body . That matters for understanding where pain originates and where infections spread.
- • Your diagram today is the reference you will use every time we analyze a patient case this unit.
PLTW connection and today's work
With access, work the teacher-assigned Activity 1.1.2 Language of Anatomy organ-cavity matching task. Without access, use the E3 Diagram limits recovery during 25-45 and keep the official task pending.
Today's stopping point: Prior introductory completion is unverified. Confirm the enrolled matching scope and stopping point; do not invent prior or current progress.
PLTW activity titles identify the course connection. If your account will not open, use the posted materials for today and tell Mr. Mendoza. Do not mark an online activity complete unless you completed it.
Course connection
- Activity 1.1.2 Language of Anatomy
Use the turn-in directions in Part 4 of this page. Do not create a second submission unless your teacher asks for one.
Show another explanation or a smaller first step
Need help? Choose a starting point
Part 3 of 4 · Worked example▸
This is a parallel case, not your own. Read it for the order of the work, then do your own in Part 4.
Planes (labeled on the figure):
- Sagittal plane: divides the body into left and right.
- Frontal (coronal) plane: divides the body into anterior (front) and posterior (back).
- Transverse plane: divides the body into superior (top) and inferior (bottom).
Cavities (labeled with one organ each):
- Dorsal cavity: cranial cavity holds the brain; spinal cavity holds the spinal cord.
- Ventral cavity: thoracic cavity holds the heart and lungs; abdominopelvic cavity holds the stomach, intestines, and bladder.
Worked reference lines, not a student completion claim:
- Separate left from right: sagittal plane.
- Separate front from back: frontal (coronal) plane.
- Separate top from bottom: transverse plane.
| Cavity | Subdivision | Example organ |
|---|---|---|
| Dorsal | Cranial | Brain |
| Dorsal | Spinal | Spinal cord |
| Ventral | Thoracic | Heart, lungs |
| Ventral | Abdominopelvic | Stomach, intestines |
This model shows the level of evidence and organization needed to complete: A reference model for one dated planes-and-cavities diagram; your own diagram, photo, official matching and submission remain separate actual work.
- Use the supplied plane and cavity definitions before drawing.
- Label the three planes, both major cavities and their subdivisions; place an example organ in each major cavity.
- Check the same diagram, add its date and three which-plane lines, then photograph it. Keep actual upload and official matching pending until verified.
Use the supplied anatomy reference for your own diagram. No new measurements, patient findings or extra investigation are required. The worked model does not complete your diagram, photo, official matching or submission.
Also due today: Complete your own dated notebook diagram and photograph it. Use your confirmed section assignment; actual upload, receipt and official matching stay pending if unavailable.
Part 4 of 4 · Your work▸
Check your work before submitting
- You can name the plane that produces a given body section.
- You can place a major organ in its correct cavity.
4.1 Turn in your work
DueCheck the Schoology assignment for this day- Hand in
- Labeled body-planes and body-cavities diagram with at least one organ placed in each major cavity.
How to submit and name your file
Submit a photo of your completed, dated notebook diagram.
In Schoology, open your course and the assignment for this lesson. Attach your file, select Submit, and check that it appears in the submission.
PDF upload helpYou get two school days for every day you were absent, so this deadline moves with you.
Choose your Schoology section. Open only one assignment.
Check the section number beside Human Anatomy and Physiology in Schoology.
Assignment: Wk3 Lab notebook: Body planes and cavities
Link will not open? Open Schoology, choose your section, and find the assignment title above.
How I will check this work
- You can name the plane that produces a given body section.
- You can place a major organ in its correct cavity.
Label planes by the portions they separate and place organs in the cavity your figure shows. A labeled diagram cannot show a real patient's organs, a mass, or which scan to order. Use the Schoology assignment linked above to submit it.
How this lesson connects
Direction words → planes and cavities on one dated diagram → next, a precise location. Name the plane by what it separates; place the organ by its cavity.
Unit 1 guide: what to keep and use nextPractice: try a question, then check your answer▸
Claim ceiling for this check: Label planes by the portions they separate and place organs in the your figure shows. A labeled diagram cannot show a real patient's organs, a mass, or which scan to order.
A surgeon needs to reach the stomach. Which major cavity does it lie in, dorsal or ventral, and name the subdivision.
Write an answer and pick a confidence to unlock the key.
Missed class or ready for more?▸
What today's skills lead to. These are real health-science careers this course builds toward. Tap one to see, on the US Department of Labor's O*NET site, what the job actually involves, what it pays, and how fast it is growing.
The that become most of the bone and of the face.
Goes with: The cells that build the face
The master switch: how a cell decides to become bone rather than something else.
Goes with: The master switch: how a cell chooses its fate
How a seam disappears: and let palatal shelves fuse.
Goes with: When palatal shelves meet: the seam must disappear
Today is individual work you can do from home: complete the same target above, then submit your Notebook check.
Submit a photo of your completed, dated notebook diagram.
Class still runs. Complete today's work as this page describes (it is self-guided). Need the concept taught without a teacher? Use this authoritative explainer:
Figure F1: body planes and cavitiesSources: slides, readings, and resources▸
Use the deck and optional notes for the same dated diagram and one photo. F1 has two reference views. The official matching stays separate; E3 Diagram limits supplies the no-access recovery. No extra exit response is due.
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