Anterior Forearm and Intrinsic hand

These flashcards cover key muscles of the forearm and hand, their attachments, nerve supply, and actions.

Pronator Teres

Muscle responsible for forearm pronation and weak elbow flexion; innervated by the median nerve.

Flexor Carpi Radialis

Muscle that flexes the wrist and aids in radial deviation; innervated by the median nerve.

Palmaris Longus

Weak wrist flexor that tightens the palmar aponeurosis; innervated by the median nerve.

Flexor Carpi Ulnaris

Muscle that flexes and adducts the wrist; innervated by the ulnar nerve.

Flexor Digitorum Superficialis

Flexes the metacarpophalangeal and proximal interphalangeal joints of digits 2-5; innervated by the median nerve.

Flexor Digitorum Profundus

Flexes the distal interphalangeal joints of digits 2-5; innervated by both ulnar and median nerves.

Flexor Pollicis Longus

Only flexor of the interphalangeal joint of the thumb (pollux); innervated by the anterior interosseous nerve.

Pronator Quadratus

Initiates forearm pronation and holds distal radius to ulna; innervated by the anterior interosseous nerve.

Abductor Pollicis Brevis

Abducts the thumb at the MCP and CMC joints; innervated by the median nerve.

Flexor Pollicis Brevis

Flexes the thumb at the MCP and CMC joints; innervated by the median nerve (and possibly the ulnar nerve).

Opponens Pollicis

Facilitates opposition of the thumb; innervated by the median nerve.

Adductor Pollicis

Adducts the thumb at the MCP and CMC joints; innervated by the deep branch of the ulnar nerve.

Abductor Digiti Minimi

Abducts the little finger and helps flex the MCP joint; innervated by the deep branch of the ulnar nerve.

Flexor Digiti Minimi Brevis

Flexes the MCP joint of the little finger; innervated by the deep branch of the ulnar nerve.

Opponens Digiti Minimi

Pulls the little finger forward towards the palm, allowing opposition; innervated by the deep branch of the ulnar nerve.

Lumbricals

Flex the MCP joints while extending the IP joints; innervated by median and ulnar nerves.

PADS

Palmar interossei muscles that adduct the digits; innervated by the deep branch of the ulnar nerve.

DABS

Dorsal interossei muscles that abduct the digits; innervated by the deep branch of the ulnar nerve.

Action of Pronator Teres

Forearm pronation and weak elbow flexion.

Innervation of Pronator Teres

Median nerve.

Action of Flexor Carpi Radialis

Flexes the wrist and aids in radial deviation.

Innervation of Flexor Carpi Radialis

Median nerve.

Action of Palmaris Longus

Weak wrist flexor that tightens the palmar aponeurosis.

Innervation of Palmaris Longus

Median nerve.

Action of Flexor Carpi Ulnaris

Flexes and adducts the wrist.

Innervation of Flexor Carpi Ulnaris

Ulnar nerve.

Action of Flexor Digitorum Superficialis

Flexes the metacarpophalangeal and proximal interphalangeal joints of digits 2-5.

Innervation of Flexor Digitorum Superficialis

Median nerve.

Action of Flexor Digitorum Profundus

Flexes the distal interphalangeal joints of digits 2-5.

Innervation of Flexor Digitorum Profundus

Ulnar and median nerves.

Action of Flexor Pollicis Longus

Only flexor of the interphalangeal joint of the thumb (pollux).

Innervation of Flexor Pollicis Longus

Anterior interosseous nerve.

Action of Pronator Quadratus

Initiates forearm pronation and holds distal radius to ulna.

Innervation of Pronator Quadratus

Anterior interosseous nerve.

Action of Abductor Pollicis Brevis

Abducts the thumb at the MCP and CMC joints.

Innervation of Abductor Pollicis Brevis

Median nerve.

Action of Flexor Pollicis Brevis

Flexes the thumb at the MCP and CMC joints.

Innervation of Flexor Pollicis Brevis

Median nerve (and possibly the ulnar nerve).

Action of Opponens Pollicis

Facilitates opposition of the thumb.

Innervation of Opponens Pollicis

Median nerve.

Action of Adductor Pollicis

Adducts the thumb at the MCP and CMC joints.

Innervation of Adductor Pollicis

Deep branch of the ulnar nerve.

Action of Abductor Digiti Minimi

Abducts the little finger and helps flex the MCP joint.

Innervation of Abductor Digiti Minimi

Deep branch of the ulnar nerve.

Action of Flexor Digiti Minimi Brevis

Flexes the MCP joint of the little finger.

Innervation of Flexor Digiti Minimi Brevis

Deep branch of the ulnar nerve.

Action of Opponens Digiti Minimi

Pulls the little finger forward towards the palm, allowing opposition.

Innervation of Opponens Digiti Minimi

Deep branch of the ulnar nerve.

Action of Lumbricals

Flex the MCP joints while extending the IP joints.

Innervation of Lumbricals

Median and ulnar nerves.

Action of PADS

Palmar interossei muscles that adduct the digits.

Innervation of PADS

Deep branch of the ulnar nerve.

Action of DABS

Dorsal interossei muscles that abduct the digits.

Innervation of DABS

Deep branch of the ulnar nerve.