Brachium And Cuvital Fossa

Question 1

What are the attachments, action, and innervation, of Biceps brachial?

Answer 1

Two joint muscle crossing vita the glenohumeral and elbow joints

Proximal Attachment:
Short head from tip of coracoid
Long head from the Supraglenoid tubercle of scapula

Distal Attachment:
Tuberosity of radius

Action:
Flexion and supination of forearm
Assists in forearm flexion

Innervation:
Muscle cutaneous nerve. (C5-C6)

Question 2

What is the attachments, actions, and innervation of the coracobrachialis?

Answer 2

Single joint muscle crosses only glenohumeral joint.

Proximal attachment:
Tip of coracoid

Distal Attachment
MIddle third of medial border of humerus
Single joint muscle crossing only glenohumeral joint

Action:
Weakly flexes and adducted arm

Innervation:
Musculocutaneous nerve
C6-C7

Question 3

What are the attachments, actions, and innervation of the brachialis?

Answer 3

Single joint muscle crossing only the elbow joint

Proximal Attachment:
Distal half of anterior surface of humerus and intermuscular septum

Distal Attachment
tuberosity of coronoid process

Action:
Main flexor of forearm

Innervation:
Musculocutaneous nerve C5-C6

Question 4

What muscles are in the posterior brachial compartment?

Answer 4

Triceps brachial: long, lateral,medial heads

Aconeus

Question 5

What are the functions of the posterior brachial compartment?

Answer 5

Forearm extensions, long head of triceps can extend shoulder (brachial), and synergistic in forearm supination

Question 6

What is the posterior brachial compartment innervated by and what are nerves passing through?

Answer 6

Innervated via Radial nerve and Functional neurological level = C7.
Median and ulnar nerve

Question 7

What vascularizes the posterior brachial compartment?

Answer 7

Deep brachial artery

Question 8

What are the triceps brachii attachments, action, and interactions?

Answer 8

Proximal attachments
Long head from infraglenoid tubercle
Lateral head from posterior surface of humerus above radial groove
Medial head from posterior surface of humerus below radial groove

Distal Attachment:
Olecranon. Process

Action:
Forearm extension
Long head also assists in arm extension

Innervation:
Radial nerve
C6 - C8

Question 9

What innervates and which nerves passes through the anterior brachial compartment?

Answer 9

Musculocutaneous nerve
Functional neurological level c5 - c6

Median nerve and ulnar nerve pass through

Question 10

What vascularizes the anterior brachial compartment

Answer 10

Brachial artery

Basilic vein and venae comitantes

Question 11

What are the attachments, actions, innervation for the Anconeus

Answer 11

Proximal:
Posterior aspect of lateral epicondyle of humerus

Distal:
Lateral surface of olecranon
Superior part of posterior surface of ulna

Actions:
Abducts ulnas during pronation of forearm
Assists triceps during forearm extensions

Innervation:
Radial nerve
C7- c8, T1

Question 12

Where is the superior lateral cutaneous nerve of the arm originate from?

Answer 12

Axillary nerve

Question 13

What branches off of the medial cord?

Answer 13

Medial brachial cutaneous nerve and the antebrachial cutaneous nerve

Question 14

Where does the lateral antebrachial nerve arise from?

Answer 14

Termination of the musculocutaneous nerve

Question 15

What branches from the radial nerve?

Answer 15

Posterior cutaneous nerve of arm and posterior cutaneous nerve of forearm

Question 16

What does the medial nerve supply?

Answer 16

Supplies the flexor muscles of the radial side of the forearm.

Travels with brachial artery

• Lateral in upper half of brachium
• Medial in lower half of brachium

Crosses cubical fossa superficially:
-w/ brachial artery
Deep to bicipital aponeurosis

Question 17

What does the ulnar nerve supply?

Answer 17

Suppliers flexor muscles on ulnar side of the forearm

• starts in anterior brachial compartment
• Medial to brachial artery
• Runs with superior ulnar collateral artery
• Pierces medial intermuscular septum
• Enters posterior compartment of the brachium
• Passes around superficial medial epicondyle
• Passes into forearm b/w two heads of flexor Capri ulnaris muscle

Question 18

What does the radial nerve supply?

Answer 18

Supplies extensor muscles in posterior compartment of brachium as well as extensor muscles of the wrist and hand . ALSO THE BRACHIOradialis extensor Capri radialis longus

Descends Posterior to the axillary artery to the axillary artery

• Spirals around the posterior surface of the humerus in the spiral (radial) groove
• accompanied by deep brachial artery

Passes into forearm (b/w the brachialis muscle medically and the brachioradialis muscle laterally)

Question 19

What does the musculocutaneous nerve innervates?

Answer 19

Pierce’s the coracobrachialis
Innervates muscles of anterior brachial compartment
Pierces fascia lateral to biceps
-CONTINUES AS LATERAL CUTANEOUS NERVE OF THE FOREARM
-SUPPLIES SKIN ON LATERAL FOREARM AS FAR AS WRIST