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KIN Study > Lec. 12 Shoulder/arm Muscles > Flashcards

Lec. 12 Shoulder/arm Muscles Flashcards

1
Q

What are the muscles that move the pectoral girdle

A

Pectoralis minor, Serratus anterior, levator scapulae, rhomoid major and minor

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2
Q

Where are the attachments of the muscles that move the pectoral girdle

A

Scapula and axial skeleton

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3
Q

Attachments and Actions of Pectoralis Minor

A
  • Coracoid process & anterior ends of ribs 3-5

- Pulls scapula forward, downward rotates scapula and elevates ribs

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4
Q

Attachments and Actions of Serratus anterior

A
  • Lateral surfaces of ribs 1-8 and anterior surface of the medial border of the scapula
  • pulls scapula down, upward rotates scapula, and elevates ribs
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5
Q

Attachments and Actions of Trapezius

A
  • superior nuchal lines & spinous processes of C2-T12 and a criminal end of the clavicle, acromion process, and spine of scapula
  • elevates scapula, upward rotates scapula, retracts scapula, depresses scapula
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6
Q

Attachments and Actions of Levator Scapulae

A
  • Transverse processes of C1-C4 and superior portion of the posterior surface of the medial border of the scapula
  • elevates scapula, downward rotated scapula
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7
Q

Attachments and Actions of Rhomboid minor/major

A
  • Spinous processes of C7-T1 (minor and T2-T5 (major) and the inferior portion of the posterior surface of the medial border of the scapula
  • elevates scapula, retracts scapula, downward rotates scapula
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8
Q

What are the 4 rotator cuff muscles

A

S - supraspinatus
I - infraspinatus
T - teres minor
S - subscapularis

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9
Q

Attachments and Actions of Deltoid

A
  • Deltoid tuberosity and anterior: acromial end of the clavicle
    lateral: acromion process
    posterior: spine of scapula
  • anterior: flexes shoulder, medially rotates shoulder, lateral: abducts shoulder, posterior: extends shoulder, laterally rotates shoulder
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10
Q

Attachments and Actions of Pectoralis major

A
  • O: clavicular: sternal end of the clavicle and sternocostal: anterior surface of the sternum and costal cartilages 1-6
    I: lateral edge of the intertubercular sulcus
  • A: clavicular: flexes shoulder
    Sternocostal: extends shoulder (when flexed)
    Both: adducts shoulder, medially rotates shoulder
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11
Q

Attachments and Actions of Latissimus dorsi

A
  • O: spinous processes of T7-L5, iliac crest and inferior 3-4 ribs
    I: intertubercular sulcus
  • A: extends shoulder, adducts shoulder, medially rotates shoulder
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12
Q

Attachments and Actions of Teres major

A
  • O: posterior surface of the inferior angle of the scapula
    I: medial edge of the intertubercular sulcus
  • A: extends shoulder, adducts shoulder, medially rotates shoulder
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13
Q

What muscles attach to the intertubercular sulcus of the humerus

A
  • Pectoral Major
  • Latissimus dorsi
  • Teres major
    “Lady between two Majors”
    (Lateral to medial)
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14
Q

Attachments and Actions if Supraspinatus?

A
  • first of rotator cuff muscles (SITS)
  • O: supraspinous fossa
    I: superior surface of the greater tubercle
  • A: abducts shoulder
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15
Q

Attachments and Actions of Infraspinatus

A
  • 2nd of rotator cuff muscles (SITS)
  • O: infraspinous fossa
    I: posterior surface of the greater tubercle
  • A: laterally rotates shoulder
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16
Q

Attachments and Actions of Teres Minor

A

*3rd of rotator cuff muscles (SITS)
- O: lateral border of the scapula
I: Posterior surface of the greater tubercle
- A: laterally rotates shoulder

17
Q

Attachments and Actions of Subscapularis

A

*4th of the rotator cuff muscles (SITS)
- O: subscapular fossa
I: lesser tubercle
- A: medially rotates shoulder

18
Q

What are the muscles that attach to the greater tubercle

A

Supraspinatus, infraspinatus, teres minor

19
Q

What muscle attaches to the lesser tubercle

A

Subscapularis

20
Q

Attachments and Actions for Biceps Brachii

A

*anterior compartment of arm
- O: longhead: supraglenoid tubercle shirt head: coracoid process
I: radial tuberosity and bicipital aponeurosis
- A: flexes shoulder, flexes elbow, supinates forearm

21
Q

Attachments and Actions of the Coracobrachialis

A
  • anterior compartment of the arm
  • O: coracoid process
    I: medial surface of the body of the humerus
  • A: flexes shoulder, adducts shoulder
22
Q

Attachments and Actions of Brachialis

A

*anterior compartment of arm
- O: anterior surface of the body of the humerus
I: coronoid process and ulnar tuberosity
- A: flexes elbow

23
Q

Attachments and Actions of the Triceps brachii

A

*posterior compartment of arm
- O: longhead: infraglenoid tubercle, lateral head: proximal portion of the posterior surface of the body of the humerus, medial head: distal portion of the posterior surface of the body of the humerus
I: olecranon process
-A: long head: extends shoulder all: extends elbow

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