E. Mention the exact location of the following structures:
(i) Sphinsters
(ii) Dura matter
(iii) Lenticels
(iv) Olfactory lobes
(v) Loop of Henle
Answers
Answer:
The fourth ventricle is in the metencephalon beneath the cerebellum. The neurocoel then continues posteriorly as the central canal of the spinal cord. Cerebrospinal fluid (CSF) is produced by filtering blood plasma in vascular structures in the roof of each of the four ventricles.
Explanation:
Where is Neurocoel located?
1) Sphinsters
Sphinsters are specialized muscles that are located at the upper esophagus (upper esophageal sphincter (UES)), gastroesophageal junction (lower esophageal sphincter (LES)), antroduodenal junction (pylorus), ileocecal junction (ICJ), and the anus (anal sphincter).
2) Dura matter
The dura mater is the outermost layer of the meninges, lying directly underneath the bones of the skull and vertebral column. It is thick, tough and inextensible. Within the cranial cavity, the dura contains two connective tissue sheets: Periosteal layer – lines the inner surface of the bones of the cranium.
3)Lenticels
Lenticels are present on the older stem of plants. The lenticel is a portion of the periderm which is developed through the activity of the phellogen. These are lens-shaped openings in the trunk of woody trees.
4) Olfactory lobes
The olfactory bulb is a structure found on the inferior (bottom) side of the cerebral hemispheres, located near the front of the brain.
5)Loop of Henle
The Loop of Henle (LoH) is a long, straight, tubular segment connecting the proximal tubule to the distal convoluted tubule and lies parallel to the collecting ducts. The LoH descends from the cortex or medulla (depending on the size/length of the nephron) into the papilla of the kidney.