Question

Septum lucidum is a part of the
A. Pseudocoel
B. Metacoel
C. Diocoel
D. Rhinocoel

Answer 1

Hint: The term septum in relation with the brain, is used to indicate the subcortical structure located near the midline of the brain. The septum that connects the two cerebral hemispheres in humans is divided into two structures namely: septum verum and septum pellucidum.

Complete answer:
Septum lucidum is a thin membrane of nervous tissue that forms a part of the medial wall in the anterior region of the lateral ventricles in the brain.
The septum lucidum is usually found between the two cerebral hemispheres in which it is present in the midline of the brain. The term is also referred as septum pellucidum which lies between the two lateral ventricles and it is considered as a translucent wall. It is attached superiorly on the middle part of the brain from the corpus callosum to the anterior part of the fornix, the area of a large bundle of fibres.
During the development of foetus, there is a space or partition between the two laminae, known as the cavum septi pellucidi, which disappears later at the infant stage. Thus, the space or cavum is occasionally called Fifth ventricle and it is also known as Pseudocoel in which it is enclosed by a septum lucidum.

Hence, the correct answer is option (A).

Note: If the septum lucidum is absent, then it affects the entire structure of the brain associated with learning difficulties such as dysplasia, changes in vision and other behavioral changes. Diagnosis for the absence of septum pellucidum can be obtained through Imaging such as MRI. But the partial or complete absence of septum lucidum occurs rarely due to multiple factors and it is not a life-threatening event.