Final Exam Flashcards
Male gonad of the stallion
Testis
The muscle responsible for keeping the penis retracted unless the stallion needs to urinate or breed
Retractor penis muscle
The structures in the stallion responsible for gel fraction, pH buffering, and energy for sperm cells
Vesicular glands
The structure thought to help flush the urethra before ejaculation
Bulbourethral gland
The penis can be divided into 3 sections called:
Root, body, glans penis
The muscle that contracts in a wave like way to expel semen and urine
Bulbospongiosum
The epididymis can be divided into three parts:
Caput, corpus, cauda
The structure that helps regulate the temperature of blood entering the male gonad
Pampiniform plexus
Three layers of meninges
Piameter, arachnoid, duramater
The vagina can be divided into
Vestibule, vaginal vault
What are the layers of the ovary?
Tunica albuginea, medulla, cortex
What percentage of the horse’s blood is RBCs?
35%
What is tidal volume and why is it important?
Amount of air a horse inhales and exhales in a single breath. Important for how much oxygen is available to the horse.
Crypts of Liberkuhn
Located in the small intestine and regenerate the lining of the wall
Brunner’s Glands
Located only in the duodenum and provide protection from stomach acid
Peyer’s Patches
located throughout the small intestine and provide immunity by releasing WBCs
What 2 complex carbohydrates are the primary source of energy for the horse?
cellulose and hemicellulose
What is chyme?
Resulting food material leaving the stomach via the pyloric sphincter
What does the pancreas do?
Dumps enzymes into the duodenum to assist with the breakdown of lipids
What are the VFAs?
Acetate, propionate, butyrate
Action of supraspinatus muscle
Extension of shoulder joint
The structure at the end of the soft palate, where the oral and nasal cavities meet
Pharynx
Where does gas exchange occur in the lungs?
The alveoli
The cardiovascular system is comprised of:
Heart, blood vessels, and blood
Primary functions of cardiovascular system
Carry gasses, hormones, nutrients, waste products and heat around the body
3 layers of the heart wall
Epicardium, myocardium, endocardium
Arteries
Carry blood away from the heart. When cut these SPURT
Veins
Carry blood from tissues back to heart. When cut these trickle
Capillaries
Form a network of thread-like vessels found all over the body
What is wind sucking?
When a mare sucks air in through her vulva
Cervix
Muscular constriction between uterus and vagina
Serous membrane of uterus
Broad ligament attachment
Myometirum layer of uterus
Muscular layer - muscles contract during labor to push foal out
Endometrium layer of uterus
Connects to foal, placenta attachment
Isthmus
Sperm storage
Ampulla
Site of fertilization
Infundibulum
Catches egg from ovary and sends to ampulla
Estrous cycle
21 day cycle in mares, divided into estrus and diestrus
Anestrous
Mare in not cycling, “rest period” for hormones
Estrus
Sexual receptivity, about 4-7 days long
Diestrus
Does not want to be bred, agitated and not receptive to stallion
FSH
Causes follicles to grow on the ovary, releases from the Anterior Pituitary gland
LH
Causes follicles to ovulate, released from anterior pituitary gland
Graafian Follicle
Most dominant follicle, active during follicular phase, eventually the egg sent to ampulla
Progesterone
Maintains pregnancy, released by the CL
PGF2a
Releases from the uterus toward the end of diestrus if mare is not pregnant, causes complete regression of the CL and starts estrous cycle over
Melatonin
Helps regulate reproductive cycle year round, released from pineal gland, will stop the mare’s reproductive cycle
Cremaster muscle
Pulls and holds testes up to abdomen
Vas deferens
How sperm leaves testis
Cryptochid
One or both testis do not descend from a colt’s body cavity, sperm production decreases, makes castration very difficult
Testicular parenchyma
Sertoli cells and leydig cells
Forebrain
Deals with memory and consciousness
Midbrain
Visual, auditory, and some olfactory
Hindbrain
Coordinates and regulates motor activities
Afferent nerves
Sensory nerves, take in information and send to central nervous system
Efferent nerves
Motor nerves, act on information received by afferent nerves
Sympathetic
Fight vs. flight response
Parasympathetic
Involuntary actions
Wobblers
Compression of the spinal cord