Muscles for the Cadaver

Question 1

Pectoralis Minor

Answer 1

O: anterior surface of ribs 3-5
I: coracoid process of scapula
A: draws scapula forward and downward
N: medial pectoral nerve

Question 2

Internal Oblique

Answer 2

O: inguinal ligament, iliac crest
I: linea alba, ribs 10-12
A: flex vertebral column and compress abdominal wall. rotates and laterally flexes trunk
N: intercostal nerve

Question 3

Transverse Abdominis

Answer 3

O: inguinal ligament, lumbar fascia, iliac crest
I: linea alba and pubic crest
A: compresses abdominal content
N: intercostal nerve

Question 4

Rectus abdominis

Answer 4

O: pubic crest and symphyses
I: cartilages of ribs 5-7, xiphoid process
A: flexes and rotates lumbar regions of vertebral column
N: intercostal nerve

Question 5

Sternocleidomastoid

Answer 5

O: manubrium of sternum and medial portion of clavicle
I: mastoid process of temporal bone, superior nuchal line of occipial bone
N: accessory nerve (CN XI)

Question 6

External Intercostal Muscle

Answer 6

O: inferior border of rib above
I: superior border of rib below
A: pulls ribs towards one another to elevate ribcage
N: intercostal nerve

Question 7

Internal intercostal Nerve

Answer 7

O: superior border of rib below
I: inferior border of rib below
A: draws ribs together and depresses rib cage
N: intercostal nerve

Question 8

Pronator Teres

Answer 8

O: medial epicondyle of humerus, coronoid process of ulna
I: lateral radius
A: pronates forearm
N: median nerve

Question 9

Palmaris Longus

Answer 9

O: medial epicondyle of humerus
I: palmar aponeurosis (fascia of palm)
A: tenses skin and fascia of palm during arm movement
N: median nerve

Question 10

Pectineus

Answer 10

O: pubis
I: linea aspera on posterior aspect of femur
A: adducts, flexes and medially rotates thigh
N: femoral nerve

Question 11

Gracilis

Answer 11

O: Inferior ramus and body of pubis
I: medial surface of tibia
A: adducts thigh, flexes and medially rotates leg
N: obturator nerve

Question 12

Adductor Magnus

Answer 12

O: ischial and pubic ramus and ischial tuberosity
I: linea aspera and adductor tubercle of femur
A: adducts and medially rotates and flexes thigh
N: obturator nerve

Question 13

Fibularis Longus

Answer 13

O: head and upper portion of lateral fibula
I: under foot to 1st metatarsal and medial cuneiform
A: plantar flexes and everts foot
N: superficial fibular nerve

Question 14

Infraspinatus

Answer 14

O: infraspinous fossa of scapula
I: greater tubercle of humerus
A: rotates humerus laterally
N: suprascapular nerve

Question 15

Supraspinatus

Answer 15

O: supraspinous fossa of scapula
I: greater tubercle of humerus
A: initiates abduction
N: supracapular nerve

Question 16

Teres Major

Answer 16

O: posterior surface of scapula
I: crest of lesser tubercle on anterior humerus
A: extends, medially rotates and adducts humerus
N: lower subscapular nerve

Question 17

Gluteus Medius

Answer 17

O: between anterior and posterior gluteal lines on lateral surface of ilium
I: lateral aspect of greater trochanter of femur
A: abducts and medially rotates thigh
N: superior gluteal nerve