COBGC Anatomy and Physiology 4

Question 1

The pelvic floor is primarily composed of which muscle group?

Accepted Answer

Levator ani and coccygeus muscles

Answer

The pelvic diaphragm consists of the levator ani (pubococcygeus, puborectalis, iliococcygeus) and coccygeus muscles, which support the pelvic viscera.

Question 2

Which pelvic diameter is the most clinically critical for assessing safe vaginal delivery?

Accepted Answer

Obstetric conjugate

Answer

The obstetric conjugate (from the inner surface of the pubic symphysis to the sacral promontory) is the shortest AP diameter of the pelvic inlet and is the critical measurement for engagement of the fetal head.

Question 3

Which hormone is responsible for the milk ejection (let-down) reflex during breastfeeding?

Accepted Answer

Oxytocin

Answer

Oxytocin, released from the posterior pituitary in response to nipple stimulation, causes contraction of myoepithelial cells around alveoli, ejecting milk into the ducts.

Question 4

In the cardinal movements of labor, which sequence correctly describes the progression?

Accepted Answer

Engagement, descent, flexion, internal rotation, extension, external rotation, expulsion

Answer

The seven cardinal movements are: engagement, descent, flexion, internal rotation, extension, external rotation (restitution), and expulsion — occurring as the fetal head negotiates the birth canal.

Question 5

Fetal station is measured relative to which pelvic landmark?

Accepted Answer

Ischial spines

Answer

Station describes the relationship of the fetal presenting part to the ischial spines; station 0 means the presenting part is at the level of the spines, with negative values above and positive values below.

(COBGC) Certified Obstetrics Gynecology Coder Practice Test

(COBGC) Certified Obstetrics Gynecology Coder Practice Test

COBGC Anatomy and Physiology 4