Anatomy-Arm

Front 1

Originates from proximal 2/3 of lateral supracondylar ride of humerus. Inserts at distal radius, lateral side just above styloid process. Flexes Forearm. Innervated by Radial Nerve

Back 1

Brachioradialis

Front 2

Originates from distal 1/3 of lateral supracondylar ridge of humerus. Inserts on base of 2nd metacarpal. Extends and abducts hand. Innervated by Radial nerve

Back 2

Extensor Carpi Radialis Longus

Front 3

Originates from lateral epicondyle of humerus. Inserts on base of 3rd metacarpal. Extends hand; some abduction of hand. Innervated by Deep Radial nerve

Back 3

Extensor Carpi Radialis Brevis

Front 4

Originates from lateral epicondyle of humerus. Inserts via 4 tendons to base of middle and distal phalanges of digits 2-5. Extends digits 2-5 at metacarpophalangeal & interphalangeal joints; extends hand. Innervated by Posterior Interosseous nerve

Back 4

Extensor Digitorum

Front 5

Originates from lateral epicondy of humerus. Inserts via extensor expansion of 5th digit. Extends and abducts 5th digit. Innervated by Posterior Interosseous nerve

Back 5

Extensor Digiti Minimi

Front 6

Originates from lateral epicondyle of humerus and posterior border of ulna. Inserts at base of 5th metacarpal. Extends and adducts hand. Innervated by posterior Interosseous nerve

Back 6

Extensor Carpi Ulnaris

Front 7

Originates from lateral epicondlye of humerus, capsule of elbow joint, and supinator crest of ulna. Inserts at proximal 1/3 radius-posterior, lateral, and anterior. Supinates forearm. Innervated by Deep Radial nerve

Back 7

Supinator

Front 8

Originates from middle 1/3 of forearm-posterior ulna, interosseous membrane and radius. Inserts at base of 1st metacarpal. Abducts thumb and hand; extends thumb at carpometacarpal joint. Innervated by Posterior Interosseous nerve.

Back 8

Abductor Pollicis Longus

Front 9

Originates from distal 1/3, dorsal radius & interosseous membrane. Inserts at base of proximal phalanx of thumb. Extends proximal phalanx of thumb at metacarpophalangeal joint. Innervated by Posterior Interosseous nerve (from Radial nerve)

Back 9

Extensor Pollicis Brevis

Front 10

Originates from distal 1/3, dorsal ulna & interosseous membrane. Inserts at extensor expansion of index finger (digit 2). Extends proximal phalanx of index finger at metacarpophalangeal joint. Innervated by Posterior Interosseous nerve (from Radial Nerve).

Back 10

Extensor Indicis

Front 11

Originates from middle 1/3, dorsal ulna & interosseous membrane. Inserts at base of distal phalanx of thumb. Extends distal phalanx of thumb. Innervated by Posterior Interosseous nerve (from Radial nerve)

Back 11

Extensor Pollicis Longus

Front 12

Part of extensor digitorum that inserts onto proximal end of middle phalanx

Back 12

Central Tendon

Front 13

Part of extensor digitorum that inserts onto proxima end of distal phalanx

Back 13

2 lateral tendons

Front 14

Central and laterl tendons of extensor digitorum are united laterally by transverse fibers and forms this

Back 14

Extensor Hood

Front 15

Caused from repetitive foreful supination and extension of wrist (backhand stroke). Pain felt in lateral elbow-inflammation (tendinitis) of common extensor tendon

Back 15

Tennis Elbow

Front 16

Before crossing elbow-motor branches to Brachioradialis & Extensor Carpi Radialis Longus muscle.
Passes elbow anterior to lateral epicondyle, deep to Brachioradialis muscle.
In proximal forearm, divides into Superficial and Deep Radial nerve

Back 16

Radial Nerve

Front 17

Runs down lateral-anterior forearm, deep to Brachioradialis muscle (with Radial artery).
At radial (lateral) border of wrist, passes to dorsal hand.
Cutaneous to lateral side of dorsal hand and proximal ends of lateral 2.5 digits.

Back 17

Superficial Radial Nerve

Front 18

Near lateral epicondyle, innervates Extensor Carpi Radialis Brevis & Supinator muscles.
Passes around lateral neck of radius & thru Supinator-name changes to Posterior Interosseous Nerve when it emerges from Supinator

Back 18

Deep Radial Nerve

Front 19

Runs with Posterior Interosseous artery down posterior side of interosseous membrane.
Supplies remaining muscles of posterior compartment

Back 19

Posterior Interosseous Nerve

Front 20

Division of brachial artery.
Runs down forearm deep to Brachioradialis muscle.
Follows fascial septum separating extensor and flexor forearm muscles.
Pulse felt on radial (lateral) side of wrist.
Gives off superficial radial artery.
At lateral wrist, artery crosses to dorsal hand and enters Anatomical Snuff Box. Continues between bases of 1st and 2nd metacarpal bones to enter deep palm of hand.

Back 20

Radial Artery