Shoulder region and arm II

Question 1

What types of muscles and how many are there in forearm and upper arm

Answer 1

forearm=5 superficial, 3 deep

upper arm=3 superficial, 5 deep, 3 extra lateral

Question 2

Label humerus

Answer 2

ref. notes greater tubercle, lesser tubercle, intertubercular sulcus (biceps attach), deltoid tuberosity, lateral supracondylar ridge, radial fossa, coronoid fossa, capitulum, olecranon fossa, medial epicondylle, lateral epicondyle, medial supracondylar ridge, radial groove,

Question 3

Label the elbow joint

Answer 3

ref. notes

Question 4

what kind of joint is the radial capitular joint and what is it responsible for

Answer 4

synovial hinge

pronation, supination, extension, flexion

Question 5

What lig.are responsible for supporting elbow joint and label

Answer 5

anular lig. radius, radial collateral lig., ulnar collateral lig.

Question 6

Functions of biceps brachii and its attachment

Answer 6

Function: supination->flexing forearm. stabilises shoulder. If elbow at 90 deg and forrearm supinated=flexor, if forearm pronated=supinator
Attachment: Long head arise from supraglenoid tubercle, short head from corocoid process, at the bottom it attaches to radial tuberosity and bicipital aponeurosis (gives added support+protection to brachial artery+medial n.)

Question 7

What does corachobracilalis do and where does it attach

Answer 7

Function: helps adduct and flex arm, stabilises shoulder
Attachment: coracoid process to midshaft of humerus

Question 8

What does brachialis do and where does it attach

Answer 8

Function: flexor of forearm (more power than biceps)
Attachment: arises from anterior shaft of humerus and attaches to coronoid process and ulnar tuberosity

Question 9

What are the muscles of the anterior arm innervated by

Answer 9

Musculocutaneous nerve (C5-7) derived from lateral cord of brachial plexus innervates biceps brachii, brachialis, coracobrachialis

Question 10

What are the different parts of the muscles of triceps brachii and where do they arise from

Answer 10

long head-arises from infraglenoid tubercle of scapula
medial head-arises from medial surface shaft of humerus
lateral head-from lateral surface of shaft of humerus
(triceps tendon attaches to olecranon of ulna)

Question 11

What are the bursae of elbow and where are they

Answer 11

subtendinous bursa-between humerus and triceps tendon
intratendinous-inside triceps tendon
olecranon bursa-beneath olecranonprotects skin from tuberosity

Question 12

where does radial n. arise from, what route does it take and what does it innervate

Answer 12

arises C5-8, T1
Innervates posterior (extensor) compartment of arm and forearm
radial n.->radiial n. in radial groove->superficial and posterior branch of radial nerve