muscle details of upper body Flashcards
origin/insertion/innervation/action/blood supply
1
Q
biceps brachii (origin/insertion/innervation/blood supply/function)
A
- Origin:
Short head -> Apex of the Coracoid process
Long head -> Supraglenoid tubercle of the scapula - Insertion
Radial tuberosity
bicipital aponeurosis - Innervation:
Musculocutaneous nerve (C5- C6) - Blood supply:
Branches of brachial artery - Function:
Flexion and supination of the forearm at the elbow joint, weak flexor of the arm at the glenohumeral joint
2
Q
Coracobrachialis muscle
(origin/insertion/innervation/blood supply/function)
A
- Origin
Coracoid process of the scapula - Insertion
Anteromedial surface of the humeral shaft - Action
Adduction and flexion of the arm at the shoulder joint - innervation
Musculocutaneous nerve (C5- C7) - Blood supply
Muscular branches of brachial artery
3
Q
Brachialis (origin/insertion/innervation/blood supply/function)
A
- Origin
Distal half of anterior surface of humerus - Insertion
Coronoid process of the ulna - Innervation
Musculocutaneous nerve (C5,C6); Radial nerve (C7) - Blood supply
Brachial artery, radial recurrent artery - Functions
Strong flexion of forearm at the elbow joint
4
Q
Triceps brachii (origin/insertion/innervation/blood supply/function)
A
- Origins
Long head - infraglenoid tubercle of the scapula
Medial head - posterior of the humerus (inf)
Lateral head - posterior of the humerus (sup) - Insertion
Olecranon of ulna and fascia of forearm - Action
Elbow joint: extension of the forearm
Shoulder joint: extension and adduction of the arm - Innervation
Radial nerve (C6-C8) - Blood supply
Deep brachial artery, superior ulnar collateral artery
5
Q
anconeus muscle (origin/insertion/innervation/blood supply/function)
A
- Origin
Lateral epicondyle of humerus - Insertion
Lateral surface of olecranon - Action
Assists in forearm extension at the elbow
Stabilization of elbow joint - Innervation
Radial nerve (C7-C8) - Blood supply
Posterior interosseous recurrent artery
6
Q
deltoid
(origin/insertion/innervation/blood supply/function)
A
- Origins:
Lateral 1/3 of Clavicle
Acromion
Spine of Scapula - Insertion
Deltoid tuberosity of humerus - Innervation
Axillary nerve (C5, C6) - Blood supply
thoracoacromial artery, subscapular artery, anterior and posterior circumflex humeral arteries, deltoid branch of deep brachial artery - Function
Clavicular part: flexion and internal rotation
Acromial part: abduction of the arm
Spinal part: extension and external rotation
7
Q
subscapularis
(origin/insertion/innervation/blood supply/function)
A
- Origin
Subscapular fossa of scapula - Insertion
Lesser tubercle of humerus - Action
Arm internal rotation
Stabilizes humeral head in glenoid cavity - Innervation
Upper and lower subscapular nerves - Blood supply
Suprascapular artery, axillary artery, subscapular artery
8
Q
infraspinatus
(origin/insertion/innervation/blood supply/function)
A
- Origin
Infraspinous fossa of scapula - Insertion
Greater tubercle of humerus - Action
Arm external rotation;
Stabilizes humeral head in glenoid cavity - Innervation
Suprascapular nerve - Blood supply
Suprascapular artery, circumflex scapular arteries
9
Q
supraspinatus
(origin/insertion/innervation/blood supply/function)
A
- Origin
Supraspinous fossa of scapula - Insertion
Greater tubercle of humerus - Action
abduction of arm, stabilization of the humeral head in the glenoid cavity - Innervation
Suprascapular nerve (C5, C6) - Blood supply
Suprascapular artery
10
Q
teres minor
(origin/insertion/innervation/blood supply/function)
A
- Origin
Lateral border of scapula - Insertion
Greater tubercle of humerus - Action
Arm external rotation, arm adduction;
Stabilizes humeral head in glenoid cavity - Innervation
Axillary nerve (C5, C6) - Blood supply
Suprascapular artery, dorsal scapular artery
11
Q
teres major
(origin/insertion/innervation/blood supply/function)
A
- Origins
Inferior angle and the lateral border of the scapula - Insertions
crest of the lesser tubercle of the humerus - Innervation
Lower subscapular nerve (C5-C7) - Blood supply
Thoracodorsal branch of subscapular artery and posterior circumflex humeral artery - Function
Extension and internal rotation of the arm, adduction
12
Q
pectoralis major
(origin/insertion/innervation/blood supply/function)
A
- Origin
Clavicular part: medial half of clavicle
Sternocostal part: anterior surface of sternum
Costal cartilages of ribs 1-6
Abdominal part: Anterior layer of rectus sheath - Insertion
crest of greater tubercle of humerus - Action
Shoulder joint: Arm adduction, Arm internal rotation
thorax: helps inspiration(rib cage elevation) - Innervation
Lateral and medial pectoral nerves (C5-T1) - Blood supply
Pectoral branches of thoracoacromial artery, perforating branches of internal thoracic artery
13
Q
pectoralis minor
(origin/insertion/innervation/blood supply/function)
A
- Origin
costal cartilages of ribs 3-5 - Insertion
coracoid process - Innervation
Medial and lateral pectoral nerves (C5-T1) - Blood supply
Thoracoacromial a. (pectoral and deltoid branches), superior thoracic a., lateral thoracic a. - Function
shoulder joint: protraction scapula
thorax: help inspiration
14
Q
extensor carpi radialis longus
A
- Origin
Lateral supracondylar ridge of humerus, lateral intermuscular septum of arm - Insertion
Posterior aspect of base of metacarpal bone 2 - Actions
Wrist joints: Hand extension, hand abduction - Innervation
Radial nerve (C5-C8) - Blood supply
Radial recurrent artery, radial collateral artery, radial artery
15
Q
extensor carpi radialis brevi
A
- Origin
Lateral epicondyle of humerus (common extensor tendon) - Insertion
Posterior aspect of base of metacarpal bone 3 - Action
Wrist joints: Hand extension, hand abduction - Innervation
Radial nerve (C5- C6) - Blood supply
Radial recurrent artery, radial artery, deep brachial artery
