Scrotum of animals
Scrotum of bull
The scrotum of bull is a diverticulum of the abdomen situated in front of the inguinal region and lodges the testicles and its appendages. It is oval in form and slightly compressed from side to side.
It is asymmetrical since the left testicle is larger, more dependent and placed a little further back. It is long and pendulous and presents a well-marked neck when not contracted. The scrotum varies in its form under the influence of cold, heat, fatigue and debility.
Structure
- It is composed of the following layers
- Skin -thick and elastic, flesh coloured and is sparsely covered with short hairs. It is marked centrally by a raphe – the raphe scroti
- This is continued forward on the prepuce and behind on the perineum. Just in front of it have two pairs of rudimentary teats
- The dartos is the internal tunic of the abdomen consists of the fibro-elastic tissue and plain muscle and is red in colour
- It forms a septum scroti along the raphe scroti dividing the cavity into two unequal parts to accommodate the testicles, of which the left being larger
- Dorsally, this septum divides into two layers which pass by the side of the penis and becomes continuous with the tunica abdominalis
- At the bottom of the scrotum, fibres connect the dartos closely with the tunica vaginalis (thus indirectly with the tail of epididymis) constituting the scrotal ligament.
- The scrotal fascia made up of three layers and are derived from oblique and transverse abdominal muscles
- Intercolumnar fascia from the aponeurosis of the external oblique muscle
- Cremasteric fascia from internal oblique muscle
- Infundibuliform fascia from transverse abdominis muscle
- The parietal layer of the tunica vaginalis, which forms a fibro serous sac, is continuous with the parietal peritoneum
Scrotum of Ram and Buck
Scrotum of Ram and Buck resembles as ox.
Scrotum of Horse
Scrotum of Horse is in the inguinal region. It is globular. The skin is dark or black coloured. The rudimentary teats are in the form of two papillae at the lower margin of the preputial orifice and are not related to scrotum.
Scrotum of Dog
Scrotum of Dog is behind the inguinal region. The skin of scrotum is pigmented and covered sparsely with fine hairs. The raphe is not distinct.
Scrotum of Boar
Scrotum of Boar is situated a short distance from the anus and is not so sharply defined from the surrounding parts as in other animals
Scrotum of Rabbit
The scrotal sacs are separate and is situated in the inguinal region
Scrotum of Cock
Scrotum of Cock is absent as testicles are abdominal in position