Dry Lab Muscles

Question 1

Diaphragm

Answer 1

I: phrenic nerve (C3-C5)
B: musculophrenic arteries, inferior phrenic arteries
A: p- costal margin, inferior border of ribs XI-XII, L3 (right crus), L2 (left crus)
d- Central Tendon
A: normal breathing at rest

Question 2

Pectoralis Major

Answer 2

I: lateral pectoral nerve (C5-T1), medial pectoral nerve (C8-T1)
B: pectoral branch of thoracoacromial trunk
A: p- medial 1/2 of the clavicle, sternum, costal head (rib VI,VII)
d- lateral lip of intertubercular crest/ dicipital groove of the humerus
A: GH joint - FLX vs. Ext, IR/ADD

Question 3

Pectoralis minor

Answer 3

I: medial pectoral nerve (C8, T1)
B: pectoral branch of thoracoacromial trunk
A: p- rib III-V
d- coracoid process of scapula
A: scapulothoracic articulation depression and anterior tilt of scapula

Question 4

Subclavius

Answer 4

Nerve to subclavius (C5, C6)
pectoral branch of thoracoacromial trunk
P- costal cartilage of rib I
D- under the surface of distal clavicle
A: depression of clavicle

Question 5

Serratus anterior

Answer 5

Long thoracic nerve (C5-C7)
Lateral thoracic and thoracodorsal arteries
P- rib 1-9
D- anterior medial border of the scapula
A: scapular protraction, holding scapula to the Thorax, upward rotation of scapula, elevation of ribs

Question 6

External and internal oblique

Answer 6

P: External surface of ribs v-xii, inferior border of x-xii, thoracolumbar fascia
D: linea alba, iliac crest, pubic tubercle
I: intercostal n. (T7-T11), subcostal n. (T12), iliohypogastric, Genital branch of Genitofemoral N.
B: intercostal arteries
A: compression of ab cavity, stabilization of pelvis
- Bi: trunk FLX
- Uni: ipsilateral SB and contralateral rot

Question 7

Transverse abdominis

Answer 7

P:Thoracolumnar fascia and inner surface of ribs vii - xii
D: linea alba, ilia crest, pubic tubercle, inguinal ligament fold
I: intercostal n. T7-T11, subcostal n T12, iliohypogastric + ilioinguinal L1
A: increase intrabdominal pressure: compression + ipsilateral rot, stabilize spine

Question 8

Rectus abdominis

Answer 8

P: xiphoid process and costal cartilage V - vii
D: pubic crest, tubercles, and pubic symphysis
I: intercostal n. T7-T11, subcostal (TI2)
A: compression and stabilizes ab, trunk FLX

Question 9

Quadratus lumborum

Answer 9

P: interior border of rib xii, lateral transverse process of L1-L4
D: posterior iliac crest, iliolumbar ligament
I: subcostal (TI2), L1-L4 lumbar spinal nerves (ventral rami)
A: bi- depression of rib xii for respiration
Uni- ipilateral SB (closed) , hip hike( open)

Question 10

Iliopsoas

Answer 10

P: transverse process, body, and discs of T12-L5 / iliac fossa
D: lesser trochanter
I: femoral n. (L2 - L4)
A: trunk FLX, ipsilateral SB (closed) / hip FLX,ER,ADD (open)