Muscles of the Hand and Nerve Supply

These flashcards cover key terms and concepts related to the muscles of the hand, their innervation, and associated clinical conditions.

Thenar Muscles

Group of muscles located at the base of the thumb responsible for its movement.

Hypothenar Muscles

Group of muscles found at the base of the little finger involved in its movements.

Adductor Pollicis

Muscle in the hand that helps in the adduction of the thumb.

Ulnar Nerve

Nerve that supplies the hypothenar muscles and the adductor pollicis.

Median Nerve

Nerve that supplies the thenar muscles and 1st and 2nd lumbricals.

Flexor Pollicis Brevis

Thenar muscle responsible for flexing the thumb.

Abductor Pollicis Brevis

Thenar muscle that abducts the thumb.

Opponens Pollicis

Thenar muscle that allows opposition of the thumb.

Lumbricals

Muscles that flex the fingers at the metacarpophalangeal joints.

Palmar Interossei

Muscles that adduct the fingers toward the third digit.

Dorsal Interossei

Muscles that abduct the fingers away from the third digit.

Froment's sign

A clinical test indicating weakness of the adductor pollicis due to ulnar nerve injury.

Carpal Tunnel Syndrome

Condition caused by compression of the median nerve at the wrist.

Guyon's Canal Syndrome

Condition resulting from compression of the ulnar nerve in the hand.

Claw Hand

Deformity resulting from ulnar nerve injury, causing inability to extend the fingers.

Ape Hand Deformity

Condition caused by median nerve injury resulting in adduction of the thumb.

Cubital Tunnel Syndrome

Compression of the ulnar nerve at the elbow.

Wrist Drop

Loss of wrist extension due to radial nerve injury.

Musculocutaneous Nerve

Nerve that supplies the anterior compartment muscles of the arm.

Radial Nerve

Nerve that supplies the extensor muscles of the forearm.

Brachial Plexus

Network of nerves formed by the ventral rami of C5, C6, C7, C8, and T1.