Superfical Muscles of the Arm and Forearm PosteriorView

Question 1

what is the origin, insertion, action and innvervation of the triceps brachii?

Answer 1

Origin:

long head: infraglenoid tubercle

lateral head: humerus above the radial groove

medial head: humerus below the radial groove

Insertion: olecranon process of the ulna

action: extension of the forearm at the elbow joint
innervation: radial nerve

Question 2

what is the origin, insertion, action and innervation of the brachioradialis?

Answer 2

no origin or insertion

action: flexion of the forearm at the elbow joint
innervation: radial nerve

Question 3

what is the origin, insertion, action and innervation of the extendor carpi radialis longus?

Answer 3

no origin or insertion

Action: entension and abduction of the hand at the wrist joint

innervation: radial nerve

Question 4

what is the origin, insertion, action and inervation of extensor carpi radialis brevis?

Answer 4

no origin or insertion

action: extension and abduction of the hand at the wrist joint

innerve

Question 5

what is the origin, insertion, action and innervation of the extensor digitorum?

Answer 5

no origin or insertion

action: extension of digits 2-5
innervation: radial nerve

Question 6

what is the origin, insertion, action and innervation of the extensor digiti minimi?

Answer 6

no origin or insertion

action: extension of the 5th digit
innervation: radial nerve

Question 7

what is the origin, insertion. action and innervation of the extensor carpi ulnaris?

Answer 7

no origin or insertion

action: extension and adduction of the hand at the wrist joint
innervation: radial nerve

Question 8

what is the origin, insertion. action and innervation of the aconeus?

Answer 8

no origin or insertion

action: extension of the forearm at the elbow joint
innervation: radial nerve

— known as the 4th head of the tricepts brachii muscle because it extends at the forearm at the elbow joint

Question 9

what muscles share the innervation of the radial nerve?

Answer 9

• anconeus
• extensor carpi ulanris
• extensor digiti minimi
• extensor digitorum
• extensor carpi radialis brevis
• extensor carpi radialis longus
• brachioradialis
• triceps brachii

Question 10

which muscles share

action: extension and abduction of the hand at the wrist joint?
innervation: radial nerve?

Answer 10

• extensor carpi radialis longus
• extensor carpi radialis brevis

Question 11

which muscles share

action: extension of the forearm at the elbow joint
innervation: radial nerve

Answer 11

• anconeus
• triceps brachii