Muscles of the Human body

Question 1

Pectorals Major - two heads

Answer 1

AT: Clavicle (clavicular head), manibrium sternum to humerus (sternocostal head) to intertubrurcular sulcus of humerus

AC: humeral adduction + internal rotation , scapular protraction and depression

IN: lateral pectoral nerves

Question 2

Pectoralis minor

Answer 2

AT: ribs 2-5 to the coracoid process

AC: downward rotation of the scapula, scapular protraction and depression

IN medial pectoral nerve

Question 3

Rhomboids

Answer 3

AT: ligamentous nuchae and T2-5 spinous process to the medial border of the scapula

AC: adduction, elevation, and downward rotation of the scapula

IN: dorsal scapular nerve

Question 4

Serratus anterior

Answer 4

AT: ribs 1-8 to medial border of the scapula

AC: scapular protraction and upward rotation / depression

IN: long thoracic nerve

Question 5

Trapezius

Answer 5

AT: Superior nuchal line and
external occipital
protuberance, ligamentum
nuchae, spinous processes
and supraspinous ligaments
of C7 and all thoracic
vertebrae

AC: scapular elevation(upper) , retraction (middle) depression (lower)

and upward rotation (upper and lower)

IN: accessory nerve (CN XI)

Question 6

Deltoid anterior, middle, posterior portions

Answer 6

AT: clavicle , acromion, spine of the scapula to the deltoid tuberosity of humerus

AC: flexion, medial rotation(anterior),
abduction(middle),
extension, external rotation (posterior)

IN: axillary nerve

Question 7

Levator Scapulae

Answer 7

AT: Transverse process of C1-C4 to the medial boarder of the scapula at the superior border

AC: Scapular elevation, downward rotation

IN: dorsal scapular nerve

Question 8

Sternocleidomastoid

Answer 8

AT: Manubrium and medial portion of clavicle to the mastoid process of the temporal bone

AC: same side flexion (ipsilateral) opposed side rotation of the neck (contralateral)

IN: spinal accessory nerve (CN XI)

Question 9

Latissimus dorsi

Answer 9

AT: spinous process of T7-T12 , thoracolumbar fascia and sacral vertebrae, last 4 ribs and inferior angle of scapula to the inter tubercular grove of the humorous

AC:IR, adduction, extension of the shoulder

IN: thoracodorsal

Question 10

Teres major

Answer 10

AT: From the inferior angle of the scapula to the crest of the lesser tubercle of the humerus
AC: shoulder IR, adduction

IN: lower subscapular

Question 11

Teres Minor

Answer 11

AT: lateral border of the scapula to the greater tubercle of the humorous
AC: ER of the scapula
IN: axillary

Question 12

Corticobrachialis

Answer 12

AT: from the coracoid process to the medial shaft of the humerus
AC: flexion of the arm
IN: musculocutanious

Question 13

Subscapularis

Answer 13

AT: subscapular fossa of the scapula to the lesser tubercle of the humerus
AC: IR, ADDuction of shoulder
IN: upper and lower subscapular nerves

Question 14

Infraspinatus

Answer 14

AT: infraspinatus fossa of the scapula to the greater tubricle of the humerus
AC:ER of the shoulder
IN: suprascapular

Question 15

Long head of the biceps

Answer 15

AT: supraglenoid tubricle of scapula too the bicep tuberosity of the radius
AC: flexion of elbow and shoulder, supination
IN: Musculocutanious

Question 16

Short head of the biceps

Answer 16

AT: coracoid process of the scapula to the bicipital tuberosity of the radius
AC: elbow and shoulder flexion, supination
IN: Musculocutaneous

Question 17

Brachialis

Answer 17

AT: anterior distal humerus to the corinoid process and tuberosity of ulna
AC: flex the elbow
IN: Musculocutanious

Question 18

Triceps

Answer 18

AT:Lateral head: posterior humerus superior to the radial groove
Long head: infraglenoid tubricle
Medial head: posterior humerus inferior to the radial groove

all attach to the olecranon process of the ulna
AC: extend the elbow
IN: radial

Question 19

Anconeous

Answer 19

AT: posterior lateral epicondyle of the humerus to the Between the olecranon process and proximal surface of the posterior side of the ulna
AC: weak elbow extensor
IN: radial

Question 20

Supraspinatus

Answer 20

AT suprascapular fossa of scapula to the greater tubricle of the humerus
AC: shoulder abduction to 15 deg.
IN: suprascapular