7.3 Bones, Muscles, and Joints of the Arms, Hands, Legs, and Feet

NIC Anatomy and Physiology does not stop at skin. The outline asks you to identify functions and structure (bones, muscles, and joints) of the arms and hands and of the legs and feet. Arkansas manicurist practical work also includes massage movements on fingers, the dorsum and palm, and, in a pedicure, the foot. Theory items will not ask you to recite two hundred muscle names. They will ask whether the thumb-side forearm bone is the radius, whether the palm bones are metacarpals, whether a finger knuckle is a hinge, and whether a hot, clot-history calf is a massage area. Independent OpenExamPrep teaching for this license stays on those exam-relevant movers and on cosmetic massage safety.

If you feel lost in Latin, sort every fact into one of four buckets: what the bone is called, what motion the muscle produces, what kind of joint allows that motion, and when you must not massage.

Bones of the arm and hand

Start at the wrist and count outward, because that is how overlay and massage questions are written.

The carpals are the eight wrist bones. You do not need every carpal on every item, but trapezium is worth extra time: it meets the first metacarpal to form the thumb's saddle joint. Scaphoid sits in the anatomical snuffbox region and is a classic fracture bone after a fall — not a salon diagnosis, but a reason a painful swollen wrist is a refer, not a "deeper massage."

The metacarpals are the five palm bones, numbered 1 at the thumb to 5 at the little finger. Distal heads are the knuckles you see when the client makes a fist.

The phalanges of the hand number fourteen: three in each finger (proximal, middle, distal) and two in the thumb (no middle phalanx). Exam traps invent a third thumb bone or call palm bones phalanges.

In the forearm, the radius is lateral in anatomic position — the thumb side. The ulna is medial — the little-finger side. When the client pronates (palm down on your table) the radius crosses over the ulna. That crossing is why a polish-hand position and a massage-hand position feel like different bones under your thumbs. The humerus is the upper-arm bone that meets radius and ulna at the elbow; you rarely massage it in a basic manicure, but you should not confuse it with the radius.

Bones of the leg and foot

The tarsals are seven ankle and hindfoot/midfoot bones. Name calcaneus (heel) and talus (the bone that meets the leg at the ankle) on sight. Navicular, cuboid, and the three cuneiforms complete the seven. The calcaneus is why a cracked heel sits on a fat pad over a large bone, not on "just skin."

The metatarsals are five long bones of the midfoot. Their heads are the ball-of-foot pressure points where callus loves to form. The first metatarsal head region is also a common bunion site — another reason that area corns and why you inspect it before you file.

The phalanges of the foot also number fourteen: two in the hallux (great toe), three in each lesser toe. Hammertoes and overlapping toes change how those small bones sit against shoes, which changes corn location.

In the lower leg, the tibia is the large medial, weight-bearing shin bone. The fibula is the thinner lateral bone. You can feel the lateral malleolus as the outer ankle knob (distal fibula) and the medial malleolus as the inner knob (distal tibia). Do not knead the sharp tibial crest as if it were a muscle belly. The femur is the thigh bone; basic pedicure massage does not treat the hip, but items may still place tibia versus femur as a distractor.

Those counts are worth a bar chart in your memory: 8-5-14 in the hand (27 bones) and 7-5-14 in the foot (26 bones). The missing bone in the foot compared with the hand is one fewer tarsal than carpal, not a missing toe.

Muscles worth naming for massage

Think in groups and actions, not in encyclopedia entries.

Anterior forearm flexors (including flexor carpi radialis, flexor carpi ulnaris, and the finger flexors) sit on the palm-up side of the forearm. They flex the wrist and fingers — the motion of making a loose fist. When you stroke from wrist toward elbow on the palmar forearm, you are following this group. Posterior forearm extensors (extensor carpi radialis, extensor digitorum, and neighbors) extend the wrist and fingers — the motion of opening the hand to dry polish. Manicure massage that only polishes the palm and ignores the extensor surface misses half the cosmetic work the exam describes as hand massage.

Pronator muscles turn the palm down; supinator (and biceps) help turn it up. You use that every time you flip the client's hand to paint versus to massage the palm.

In the hand itself, the thenar eminence is the fleshy pad at the thumb; the hypothenar eminence is the pad at the little finger. Those intrinsic muscles position the thumb and pinky for grip. Lumbricals and interossei fine-tune finger spread and "table-top" flexion at the knuckles. You do not need every interosseous name; you do need to know the meaty thumb pad is thenar muscle over the first metacarpal, not a mystery tumor.

In the lower leg, gastrocnemius and soleus form the calf and plantarflex the foot (point the toes, press a gas pedal). Tibialis anterior on the shin dorsiflexes (lifts the foot so the toes come up). Fibularis (peroneus) longus and brevis evert the foot (tilt the sole outward). Long flexors and extensors of the toes run from leg into the foot; intrinsic foot muscles fine-tune the arches. Pedicure massage of a healthy foot often uses effleurage along the dorsum (extensor tendons) and the plantar pad, and careful work on a soft calf only when that tissue is clearly healthy.

Biceps flexes the elbow; triceps extends it. Those names show up as distractors next to wrist movers. For nail theory, elbow movers matter less than wrist, finger, ankle, and toe movers — unless the item literally points at the upper arm.

Joints: hinge, gliding, saddle

A hinge joint moves mainly in one plane, like a door. Elbow, knee, and the interphalangeal (IP) joints of fingers and toes are hinges. The ankle (talocrural) joint is hinge-like for dorsiflexion and plantarflexion. When a client cannot bend a finger IP joint, polish application changes; you do not force a hinge.

A gliding (plane) joint allows small sliding moves. Many intercarpal and intertarsal joints are gliding joints. That is why a wrist can adapt when you place the hand on a towel, and why a stiff midfoot is not something you "crack" in a salon.

A saddle joint has two concave-convex surfaces that fit like rider and saddle. The carpometacarpal joint of the thumb (trapezium plus first metacarpal) is the exam classic. It allows opposition — thumb to fingertips — which is how the client holds a phone and how you hold a brush. Arthritis or injury there changes grip; you massage gently around a painful thumb CMC, you do not wrench it.

Know two other names so distractors fail: ball-and-socket (shoulder, hip) and pivot (proximal radioulnar joint helping pronation/supination). A thumb CMC is not a hinge. Neighboring carpals are not a saddle.

Massage safety: cosmetic, not medical

NIC manicure and pedicure procedure language includes safe application of massage manipulation and the mechanics of effleurage, petrissage, friction, and tapotement. Those strokes belong on healthy tissue. Anatomy in this chapter exists so you know what you are rubbing — and what you must not treat as a "circulation therapy."

Never massage inflamed or infected tissue. Heat, spreading redness, pus, open skin, and tinea or herpes lesions are infection-control stops, not petrissage opportunities. Massage increases blood flow locally and can hurt; it does not sterilize.

Never massage a thrombophlebitis-risk or suspected-clot leg as if salon work were medical treatment. Deep vein thrombosis and superficial thrombophlebitis are physician problems. A client who reports calf pain, heat, unilateral swelling, shortness of breath, or a history of blood clots does not get "extra-deep calf work to break it up." You could theoretically dislodge a clot; more simply, you are practicing medicine without a license. Withhold massage of that limb, do not treat the swelling, and refer. If the rest of a pedicure is even in question, refuse rather than bargain.

Stay inside cosmetic massage of healthy tissue: lotion on an intact, non-tender forearm flexor group; gentle plantar effleurage on a cool, non-swollen foot; no digging on varicose veins, no work on the shin bone, no "sports medicine" story to the client. Arkansas practical scoring still wants visible massage movements on a well mannequin or model. Real clients with red flags override the performance habit.

Salon picture

During a Fayetteville pedicure, the left calf is soft and even. The right calf is hot, larger, and the client mentions a long car trip and a prior clot. You may complete cosmetic work that does not require you to knead the right leg — and you do not massage that calf, apply heat packs as therapy, or tell the client you "moved the circulation." You refer. Theory items are written to reward that refusal.

Traps

Metacarpals are palm bones, not wrist bones. Tarsals are not the same count as carpals. The radius is the thumb-side forearm bone. The tibia, not the fibula, is the main weight-bearing lower-leg bone. The thumb CMC is a saddle, not a hinge. Calf massage is not a treatment for clots, cellulitis, or infection. Recheck bone and joint wording on the NIC bulletin your Arkansas provider posts; this section teaches the structure those items use.