Exam 2 - Abdomen and Thorax

Question 1

External intercostal muscle

Answer 1

fibers go down and medially
Origin: upper rib, inferior border
Insertion: lower rib, upper border
Action: inspiration 
Nerve: intercostal nerves

Question 2

Internal intercostal muscle

Answer 2

fibers go up and medially
Origin: lower rib, upper border
Insertion: upper rib, inferior border
Action: force expiration
Nerve: intercostal nerves

Question 3

Innermost intercostal muscle

Answer 3

Origin: rib above
Insertion: rib below
Action: blank
Innervation: intercostal nerves

Question 4

Transverse thoracis

Answer 4

Origin: posterior surface of sternum and xiphoid process
Insertion: central tendon
Action: blank
Innervation: intercostal nerves

Question 5

linea alba

Answer 5

formed from convergence of the aponeurosis of the abdominal muscles
xiphoid process -> pubic symphysis

Question 6

External abdominal oblique

Answer 6

Origin: lower 8 ribs
Insertion: linea alba, pubic tubercle, and iliac crest
Actions: laterally flexes and rotates spine, increase abdominal pressure, assists respiration
Nerves: lower intercostal nerves

Question 7

Internal abdominal oblique

Answer 7

Origin: lumbar fascia, iliac crest, inguinal ligament
Insertion: linea alba, last 4 ribs, pubic crest
Actions: laterally flexes and rotates spine, increase abdominal pressure, assists respiration
Nerves: lower intercostal nerves

Question 8

Transverse abdominis

Answer 8

Origin: lumbar fascia, iliac crest, inguinal ligament
Insertion: linea alba, pubic crest
Actions: laterally flexes and rotates spine, increase abdominal pressure, assists respiration
Nerves: lower intercostal nerves

Question 9

Rectus abdominis

Answer 9

Origin: pubic bone
Insertion: xiphoid process, lower 6 ribs
Actions: increases abdominal pressure, assists respiration
Nerves: lower intercostal nerves

Question 10

Spermatic cord

Answer 10

life support system for testes. Passes from the scrotum, through the inguinal canal, to the abdomen. 
Contents: 
1. Vas deferens
2. Testicular artery
3. Pampiniform plexus of veins
4. Ilioinguinal nerve
5. Cremaster muscle

Question 11

Descent of testis

Answer 11

peritoneum herniates through the inguinal canal and into the scrotum forming the process vaginalis

Question 12

Inguinal hernia

Answer 12

intestines herniate inguinal canal and descend into scrotum

Question 13

Cremaster muscle is a continuation of

Answer 13

the internal oblique; elevates scrotum and testes

Question 14

Dartos muscles

Answer 14

smooth muscle in scrotum, controls wrinkles to regulate temperature

Question 15

Sperm development optimal temp

Answer 15

95 F