Chest and Abdominals

Question 1

Pectoralis Major
(O, I, A, N)

Answer 1

O:
Clavicular head:
Medial 1/2 of clavicle
Sternal head:
sternum & costal cartilages #1-#7
I: Lateral lip of the bicipital groove
A:
-Flexion, Adduction & Medial rotation of the arm @ the shoulder jt.
-Horizontal adduction of the arm @ the shoulder jt.
N: Medial & lateral Pectoral nerves

Question 2

Pectoralis Minor
(O, I, A, N)

Answer 2

O: Ribs #3-#5
I: Coracoid process of scapula
A:
-Protraction & depression of the scapula @ the scapulocostal jt.
-Elevates ribs #3-#5 @ the sternocostal & costospinal jts.
N: Medial & lateral Pectoral nerves

Question 3

Serratus Anterior
(O, I, A, N)

Answer 3

O: Ribs #1- 9
I: Anterior surface of the medial border of scapula
A:
- Protraction and upward rotation of the scapula @ the scapulocostal jt.
N: Long thoracic nerve

Question 4

Subclavius
(O, I, A, N)

Answer 4

O: 1st rib
I: Middle 1/3 of inferior surface of clavicle
A:
-Depresses clavicle @ the sternoclavicular jt.
-Elevates 1st rib @ sternocostal & costospinal jts
N: Brachial plexus

Question 5

External Intercostals
(O, I, A)

Answer 5

O: Inferior border of a rib
I: Superior surface of rib directly below
A: Elevates ribs @ Costospinal & Sternocostal jts.

Question 6

Internal Intercostals
(O, I, A)

Answer 6

O: Superior border of 1 rib
I: inferior surface of rib directly above
A: Depresses ribs @ the costospinal jt & sternocostal jts.

Question 7

Innermost Intercostals
(O, I, A)

Answer 7

O: Interior of superior surface of rib below
I: Interior of inferior surface of rib above
A: Depresses ribs @ costospinal jts. & sternocostal jts.

Question 8

Transversus Thoracis
(O, I, A)

Answer 8

O: Internal surface of sternum, xyphoid, & costal cartilages
I: Internal surfaces of costal cartilages #2-#6
A: Depresses ribs # 2-6 @ sternocostal jts & costospinal jts.

Question 9

External Obliques
(O, I, A, N)

Answer 9

O:
-Anterior iliac crest
-Pubic bone
-Abdominal aponeurosis
I: Ribs #5-12
A: -Flexion, lateral flexion & contralateral rotation of the trunk @ the spinal jts.
-Posterior tilt of pelvis
N: Intercostal
nerves

Question 10

Internal Obliques
(O, I, A, N)

Answer 10

O:
-Inguinal ligament
-Iliac crest
-T-L fascia
I: Ribs #10-12 & Abdominal aponeurosis
A: -Flexion, Lateral flexion & Ipsilateral rotation of the trunk @ the spinal jts.
-Posterior pelvic tilt
N: Intercostal
nerves

Question 11

Rectus Abdominus
(O, I, A, N)

Answer 11

O: Pubis
I: xiphoid process and costal cartilages of ribs #5-#7
A:
-Flexion of the trunk @ the spinal jts.
-Posterior tilt of pelvis
N: Intercostal nerves

Question 12

Transversus Abdominis
(O, I, A)

Answer 12

O:
* Inguinal
ligament
* Iliac crest
* T L fascia
* Costal
cartilage
I: Abdominal
aponeurosis
A: Compresses the abdominopelvic cavity

Question 13

Diaphragm
(O, I, A)

Answer 13

O: Lumbar spine (L1-L3), Ribs #7-12 & their costal cartilages, Sternum
I: Central tendon of diaphragm
A: Increases the volume of the thoracic cavity via abdominal breathing

Question 14

Psoas Major
(O, I, A)

Answer 14

O: Vertebral bodies, TvPs & discs from T12- L5
I: Lesser trochanter of femur
A:
-Flexion of the trunk @ the spinal jts.
- Flexion & lateral rotation of the thigh @ hip jt.
-Anterior pelvic tilt

Question 14

Psoas Minor
(O, I, A)

Answer 14

O: Bodies, disc & TvPs of T12-L1
I: Pubis
A:
-Flexion of trunk @ the spinal jts.
-Posterior pelvic tilt

Question 15

Illacus
(O, I, A)

Answer 15

O: Anterior surface of the internal ilium
I: Lesser trochanter of femur
A:
-Flexion & lateral rotation of thigh @ hip jt.
-Anterior pelvic tilt