Ch.36 Cecum Flashcards
Size and capacity of cecum
1 meter
30 liters
What does the base of the cecum have attachments to
Mesenteric attachments to
- Dorsal body wall btw rib 14 and the
tuber coxae - Right kidney
- Transverse colon
- Root of the mesentery
- Pancreas
What is the cupula
Cranial aspect of base of cecum
Base of cecum is divided into 2 by a transverse fold - the cranial aspec
Which tenai continue to apex
Dorsal and medial
Ventral often blends into medial
Lateral is variable, might discontinue mid way
The dorsal tenai is connected to what and where
Ileum anti mesenteric side - ileocecal fold
The lateral tenai is connected to what and where
Lateral free tenai of the right ventral colon - cecocolic fold
Blood supply of cecum
med and lat cecal aa. <- ileocolic a. <-Cranial mesenteric artery
medial a is main blood supply to apex
cecal rete arise from both forming a submucosal plexus
Where is the ileocecal orifice located
Lesser curvature of cecal base
At level of 1st or 2nd lumbar vertebrae
Where is the cecocolic orifice located
Caudal and lateral to the ileocecal orifice where it empties into right ventral colon
Main physiologic function of the cecum
Absorption of water and electrolytes esp sodium and chloride
Act as a reservoir for microbial digestion of insoluble carbohydrates
When does the cecum have its largest influxes and absorption of water in ponies
First 2 hours after a meal - influx
600-800mL/hr abs during next 10 hours between meals
Fermentation of insoluble carbohydrates in the cecum produces what
Volatile fatty acids - acetic, propionic, butyric.
Abs by cecum and LC - Provide energy for horse
Heat
What is the cecal arterial rete
Mesh like network of vessels originating from lateral & medial cecal aa which feed into submucosa plexus.Perpendicular to the main vessels.
Supplies alternative blood supply
Where are contractions of the cecum said to originate
Ventral cecal body near apex and move toward base
Which drug has been shown to decrease cecal movement most significantly
Buscopan - 30 mins
Xylazine 20-30 mins
Butorphanol - 10 mins
Detomodine
xylazine hydrochloride Butorphanol tartrate Administered together, both drugs work synergistically to reduce cecal motility
