Inguinal canal and scrotum

Question 1

how is the inguinal canal formed

Answer 1

aponeurosis of external oblique rolls over itself forming anterior wall

Question 2

what is the posterior wall of the canal

Answer 2

transversalis fascia
deep inguinal ring is opening in this layer

Question 3

what does the external spermatic fascia arise from

Answer 3

edges of superficial inguinal ring

Question 4

what is the internal fascia of the spermatic cord derived from

Answer 4

edges of deep inguinal ring

Question 5

structures passing through deep inguinal ring - males

Answer 5

spermatic cord
vas deferens
genital branch of genitofemoral nerve
testicular artery and vein

Question 6

structures passing through the deep inguinal ring in females

Answer 6

round ligament of uterus
genital branch of genitofemoral nerve

Question 7

structures of anterior wall of inguinal canal

Answer 7

aponeurosis of external oblique
internal oblique in lateral 1/3 - corresponds to weak area of deep ring

Question 8

floor of inguinal canal

Answer 8

external oblique aponeurosis

Question 9

roof of inguinal canal

Answer 9

external oblique aponeurosis, internal oblique and transversus abdominis

Question 10

posterior wall of inguinal canal

Answer 10

transversalis fascia
conjoint tendon medially - corresponds to weakness in anterior wall

Question 11

what forms the conjoint tendon

Answer 11

tendons of internal oblique and transversus abdominis combine to attach to the pelvis

Question 12

describe indirect inguinal hernias

Answer 12

canal entered via congenital weakness at deep inguinal ring

Question 13

describe direct inguinal hernias

Answer 13

pushes through weak spot in back of inguinal canal

Question 14

list the contents of the spermatic cord

Answer 14

vas deferens and artery
testicular artery and vein
cremasteric artery
genital branch of genitofemoral nerve
lymph vessels
autonomic nerves

Question 15

smooth muscle of scrotum

Answer 15

dartos

Question 16

action of cremaster muscle

Answer 16

moves scrotum and testes upwards towards body wall

Question 17

closest layer to testis

Answer 17

tunica vaginalis

Question 18

state the origins of the fascial layers of the scrotum

Answer 18

internal spermatic fascia - transversalis fascia @ deep inguinal ring
cremasteric fascia - internal oblique
external spermatic fascia - external oblique @ superficial inguinal ring

Question 19

describe the lymphatic drainage of the scrotum and tetsis

Answer 19

scrotum - superficial inguinal nodes
tetsis - para-aortic nodes (L2)