Bryan - Gross Anatomy - Inguinal Structures

Front 1

What does inguinus mean? Where is it located?

Back 1

Inguinis = groin (L)
Located between abdomen and thigh

Front 2

What is and/or can be found coursing through the inguinal canal?

Back 2

External pudendal a. and v.
Genitofemoral n.
Lymphatics
Vaginal tunic (male)
Vaginal process (bitch)
Spermatic cord (male)

Front 3

Where is the superficial inguinal ring found?

Back 3

Slit in the aponeurosis of the external abdominal oblique

Front 4

What are the boundaries of the deep inguinal ring?

Back 4

(Cranial boundary) - Caudal border of internal abdominal oblique
(Medial boundary) - lateral border of rectus abdominis
(Caudal boundary) - inguinal ligament

Front 5

Where is the inguinal ligament found?

Back 5

Between the tuber coxae and iliopubic eminence of the pelvis
(caudal border of internal abdominal oblique)

Front 6

What are these structures (areas)? What do A + C comprise?

Back 6

A - Deep Inguinal Ring
B - Vascular lacuna
C - Superficial inguinal ring
A + C = inguinal canal

Front 7

What courses through the vascular lacuna? What separates this from the inguinal canal?

Back 7

Femoral vessels
Inguinal ligament

Front 8

Describe the branching of the aorta giving rise to the external pudendal a.

Back 8

Descending aorta
External iliac a.
Femoral a.
Deep femoral a.
Pudendoepigastric trunk
External pudendal a.

Front 9

What provides the major blood supply to the cow's udder?

Back 9

External pudendal a.

Front 10

What comprises the genitofemoral n.?
What does it innervate?

Back 10

Ventral brs. of L3 and L4 spinal nn.
Motor to cremaster m.
Sensory to inguinal region and proximal medial thigh.

Front 11

T or F
Yo dawg! That bitch gots a vaginal process!

Back 11

True. Dogs (not dawgs) are thought to be the only females with a vaginal process.

Front 12

What membrane wraps around the testis? What are the layers of this membrane called?

Back 12

Vaginal tunic (vaginal process during development)
Visceral and parietal layers

Front 13

What are these structures?

Back 13

A - Spermatic fascia
B - Parietal vaginal tunic
C - Visceral vaginal tunic
D - Cremaster m.
E - Vaginal cavity

Front 14

What comprises the clinical vaginal tunic?

Back 14

Spermatic fascia (from transversalis fascia)
Parietal vaginal tunic

Front 15

What are these structures? What surrounds structure F?

Back 15

A - Parietal vaginal tunic
B - Ductus deferens
C - Vaginal tunic (cut)
D - Ligament of tail of epididymis
E - Proper ligament of testis
F - Testis (surrounded by visceral vaginal tunic)

Front 16

What is the proximal boundary of the spermatic cord?

Back 16

Vaginal ring

Front 17

What components comprise the spermatic cord?

Back 17

Testicular a., v. and n.
Pampiniform plexus
Ductus deferens
Deferent a. and v.
Internal cremaster m. (smooth)
Mesofuniculum

Front 18

What venous network keeps the testes cool?

Back 18

Pampiniform plexus

Front 19

Where do the R and L testicular vv. drain?

Back 19

R - caudal vena cava
L - left renal v.

Front 20

T or F
The testicular aa. branch off of the internal iliac arteries.

Back 20

False fool!
These arteries branch off of the descending aorta!

Front 21

Which vein or veins do the right and left testicular veins drain into?

Back 21

R. Testicular V. - caudal vena cava
L. Testicular V. - left renal v.

Front 22

What structure carries sperm from the epididymis to the urethra?

Back 22

Ductus deferens (vas deferens)

Front 23

Name these structures in this transverse section of a spermatic cord.

Back 23

A - Mesofuniculum
B - Mesoductus deferens
C - Mesorchium
D - Cremaster m.

Front 24

T or F
The cremaster m. is one of many structures coursing within the spermatic cord.

Back 24

False you silly!
The cremaster m. courses OUTSIDE of the vaginal tunic.

Front 25

Compare/contrast the scrota of the dog and cat.

Back 25

Dog - scrotum is inguinal and has little hair
Cat - scrotum is perineal and has hair

Front 26

What type of autonomic fibers comprise the testicular n.?

Back 26

Postganglionic sympathetic fibers from L4, 5, and 6 of sympathetic trunk

Front 27

T or F
The internal cremaster m. is one of many structures coursing within the spermatic cord.

Back 27

Yup. The internal cremaster is smooth muscle while the cremaster m. is skeletal.

Front 28

What is the perineal region?

Back 28

The region between the anus and scrotum.
As defined by Urban Dictionary: "The jagged or wavy line between your marble bag and balloon knot."

Front 29

What tunics cover the testes?

Back 29

Tunica albuginea (fibrous capsule)
Visceral vaginal tunic

Front 30

What is the function of the testes? The epididymis?

Back 30

Testis - sperm and hormone production
Epididymis - sperm storage and maturation

Front 31

Name these structures (medial view)

Back 31

A - Cremaster m.
B - Pampiniform plexus
C - Head of epididymis
D - Testis
E - Tail of epididymis

Front 32

How is the head of the epididymis positioned in the dog? In the cat?

Back 32

Dog - craniodorsally
Cat - cranioventrally

Front 33

What is the function of the tunica dartos?

Back 33

Helps to pull testes to body

Front 34

Name these structures

Back 34

A - Skin and tunica dartos
B - External spermatic fascia
C - Internal spermatic fascia
D - Parietal vaginal tunic
E - Vaginal cavity
F - Visceral vaginal tunic
G - Tunica albuginea

Front 35

What structure is responsible for the developmental descent of the testes? What kind of tissue is this structure comprised of?

Back 35

Gubernaculum testis
Condensation of mesenchymal tissue

Front 36

What are the remnants of the gubernaculum in the male? How 'bout the female?

Back 36

Proper ligament of testis
Ligament of the tail of the epididymis
(female) round ligament of the uterus