Anatomical Foundations: Terminology, Body Planes, and the Skeletal System

Objective. Given a unlabeled skeletal diagram, students will correctly identify and label at least 85% of major bones and bony landmarks using standard anatomical terminology and directional terms.

Why Anatomical Terminology Matters in Massage Therapy

Before you place your hands on a client, you must be able to speak the language of the body. Standardized anatomical terminology lets you communicate precisely with other healthcare providers, document session notes accurately, and stay within your scope of practice. Vague descriptions like "the shoulder area" can lead to misunderstandings; "the superior angle of the scapula" cannot.

Accuracy in terminology is also a patient-safety issue. Knowing exactly which bone, muscle, or landmark you are working near helps you avoid endangering nerves, blood vessels, and vulnerable structures—such as the carotid triangle of the neck or the popliteal fossa behind the knee.

Anatomical Position and Directional Terms

Anatomical position is the universal reference point: the body is standing upright, feet together, palms facing forward. All directional terms assume this position, regardless of how the client is lying on your table.

Key directional pairs:

Superior / Inferior — toward the head / toward the feet. The clavicle is superior to the sternum.
Anterior / Posterior — toward the front / toward the back. The sternum is anterior to the thoracic vertebrae.
Medial / Lateral — toward the midline / away from the midline. The tibia is medial to the fibula.
Proximal / Distal — closer to the point of origin or trunk / farther from it. Used mainly for limbs: the elbow is proximal to the wrist.
Superficial / Deep — toward the surface / toward the interior. The trapezius is superficial to the rhomboids.
Ipsilateral / Contralateral — on the same side / on the opposite side. Pain in the right hip that refers to the right knee is ipsilateral.

Body Planes

Imagine the body divided by flat, invisible cuts:

Sagittal plane — divides the body into left and right portions. The midsagittal (median) plane runs exactly down the center.
Frontal (coronal) plane — divides the body into anterior and posterior portions.
Transverse (horizontal) plane — divides the body into superior and inferior portions. Cross-sectional MRI images are taken in this plane.

Knowing planes helps you describe movement and position: a client lying face-up (supine) is viewed from the anterior aspect; lateral flexion of the spine occurs in the frontal plane.

Body Cavities

The body contains two main cavity groups:

Dorsal cavity — houses the brain (cranial cavity) and spinal cord (vertebral/spinal cavity).
Ventral cavity — divided by the diaphragm into the thoracic cavity (heart, lungs) and the abdominopelvic cavity (digestive organs, kidneys, reproductive organs).

As a massage therapist you will not enter these cavities, but knowing their location helps you recognize contraindicated areas and understand referral patterns.

The Skeletal System: An Overview

The adult human skeleton contains 206 bones. It is divided into two regions:

Axial skeleton (80 bones) — the skull, vertebral column, sternum, and ribs. This forms the central axis of the body.
Appendicular skeleton (126 bones) — the bones of the upper and lower limbs plus the pectoral and pelvic girdles.

Major Bones and Bony Landmarks

Skull and face: frontal, parietal (×2), temporal (×2), occipital, sphenoid, ethmoid; facial bones include the mandible, maxilla, and zygomatic bones.

Vertebral column: 7 cervical (C1–C7), 12 thoracic (T1–T12), 5 lumbar (L1–L5), sacrum (5 fused), coccyx (3–5 fused). C1 = atlas, C2 = axis.

Thorax: 12 pairs of ribs and the sternum (manubrium, body, xiphoid process).

Upper limb: clavicle, scapula, humerus, radius, ulna, 8 carpals, 5 metacarpals, 14 phalanges per hand.

Lower limb: os coxa (ilium, ischium, pubis fused), femur, patella, tibia, fibula, 7 tarsals (calcaneus, talus, navicular, cuboid, 3 cuneiforms), 5 metatarsals, 14 phalanges per foot.

Key bony landmarks massage therapists palpate: mastoid process, occiput (occipital protuberance), C7 spinous process (vertebra prominens), acromion process, coracoid process, medial/lateral epicondyle of the humerus, ASIS (anterior superior iliac spine), PSIS (posterior superior iliac spine), greater trochanter, medial/lateral malleolus, calcaneus.

Safety Considerations

Avoid sustained direct pressure on bony prominences (e.g., spinous processes, sacrum) in clients with osteoporosis or a history of fractures.
The radial nerve wraps around the shaft of the humerus; careless pressure in that region can cause temporary nerve impingement.
Never apply deep pressure over the anterior cervical region, which contains major blood vessels and nerves.
If a client reports unexpected bone pain or a history of cancer, refer to a physician before proceeding; bone metastasis is a systemic contraindication.
Always document the specific bones and landmarks addressed in session notes using correct anatomical terminology.

Key terms8

Anatomical positionThe standard reference posture: body erect, feet together, arms at the sides, palms facing forward. All directional terms are defined relative to this position.

Sagittal planeA vertical plane that divides the body into left and right portions; the midsagittal plane passes exactly through the midline.

Proximal / DistalDirectional terms used for limbs: proximal means closer to the trunk or point of attachment; distal means farther from it.

Axial skeletonThe 80 bones that form the central axis of the body: skull, vertebral column, sternum, and ribs.

Appendicular skeletonThe 126 bones of the upper and lower limbs and the pectoral and pelvic girdles.

Bony landmarkA palpable surface feature of a bone—such as a process, tubercle, or spine—used to locate muscles, nerves, and blood vessels during assessment and massage.

ASIS (Anterior Superior Iliac Spine)The prominent anterior projection of the ilium, easily palpated at the front of the pelvis; a key landmark for locating hip flexor muscles and assessing pelvic alignment.

Vertebra prominensThe spinous process of C7, the most prominent posterior cervical projection, used as a landmark for counting vertebrae and locating upper thoracic structures.

In class: Instructor-led lecture with annotated diagrams covering anatomical position, directional terms (superior/inferior, medial/lateral, proximal/distal, etc.), body planes, and body cavities; students take guided notes on a pre-printed skeleton outline. · Small-group bone-identification relay using a disarticulated plastic skeleton model: each group races to correctly name and place labeled tags on assigned bones and landmarks, then swaps models to verify peers' work. · Individual flashcard drill session using printed or digital (Anki/Quizlet) cards for all 206 bones and key landmarks; students self-quiz, then a partner quizzes them aloud using the model.
Materials: Full plastic articulated skeleton model, disarticulated bone set, anatomical diagrams (Trail Guide to the Body or equivalent), whiteboard, printed skeleton outline worksheets, Quizlet/Anki deck, colored markers for annotation
Check: Exit ticket: students complete a 20-item fill-in-the-blank skeletal diagram without aids; passing standard is 85% (17/20 correct).

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.