Flashcards in Muscles Deck (34)
Loading flashcards...
1
What are the Superficial Extrinsic Shoulder Muscles and the Deep Extrinsic Shoulder Muscles?
Superficial:
Trapezius
Latissimus Dorsi
Deep:
Levator Scapulae
Rhomboids
2
What are the Scapulohumeral Muscles?
Deltoid, Teres Major
3
What are the rotator cuff muscles?
Supraspinatous
Infraspinatus
Teres Minor
Subscapularis
4
What are the Trapezius attachments?
Origin - Axial Skeleton (Skull down to T12)
Attachments - Posterior surface of scapula and clavicle
5
What is the Trapezius Innervated by?
Accessory Nerve (C3 and C4)
6
Trapezius actions
Upper fibres rotate and elevate scapula
Middle fibres retract scapula
Lower fibres pull scapula inferiorly
7
How can you test the accessory nerve?
Elevate shoulder against resistance
8
Latissimus Dorsi attachments
Originates thoracic spine, iliac crest and the inferior 3 ribs.
Attaches to intertubecular groove of humerus
9
Latissimus Dorsi innervation
Thoracodorsal nerve
10
Latissimus Dorsi actions
Extension of the arm at the shoulder
Adduction at the shoulder
Medial rotation of the arm
11
Levator Scapulae attachments
Transverse processes of C1-C4 vertebrae
Attaches to the medial border of the scapula, superior to spine
12
Levator Scapulae innervation
Dorsal scapular nerve
13
Levator Scapulae actions
Elevates scapula
Rotates scapula to tilt glenohumeral joint inferiorly
14
Rhomboid attachments
Minor: C7-T1 vertebrae
Major: T2-T5 vertebrae
Attach medial border of scapula
15
Rhomboid innervation
Dorsal scapula nerve
16
Rhomboid Actions
Retracts scapula
Rotates scapula to tilt glenohumeral joint inferiorly
Can also fix the scapula to the thoracic wall
17
Deltoid attachments
Originates: Scapula and Clavicle
Attachments: Deltoid tuberosity on the lateral surface of the humerus
18
Deltoid Innervation
Axillary nerve
19
Deltoid Actions
Anterior: flex the arm at the shoulder
Posterior: extend the arm at the shoulder
Middle: major abductor of the arm 15-90
20
Teres Major attachment
Originate: the inferior angle of the scapula on the posterior side
Attachment: intertubecular groove of the humerus
21
Teres Major innervation
lower subscapular nerve
22
Teres Major actions
Adducts at the shoulder
medially rotates the arm
23
Supraspinatus attachments
Originates from the supraspinous fossa on the posterior surface of the scapula
Attachment: greater tuberosity of the humerus
24
Supraspinatus innervation
suprascapular nerve
25
Supraspinatous Actions
First 15 degrees of arm adduction
26
Infraspinatous attachments
Origin: infraspinous fossa
Attaches: greater tubercle of the humerus
27
Infraspinatous innervation
Innervated by the suprascapular nerve
28
Infraspinatous action
Lateral rotation of the arm
29
Subscapularis attachments
Origin: Subscapularis fossa, costal surface of scapular
Attaches: lesser tubercle of humerus
30
