Question

Which foramen is paired in the mammalian brain?
A. Foramen of Luschka
B. Foramen of Magendie
C. Foramen of Monro
D. Interventricular foramen

Answer 1

Hint: The human brain is the most complex organ of the human body. It controls every aspect of the human body ranging from physiological functions to cognitive abilities.

Complete answer:
- The brain is enclosed within the skull, which provides frontal, lateral, and dorsal protection. The brain consists of the forebrain, midbrain, and hindbrain. The lateral aperture is a paired structure in mammals.
- It is an opening in each lateral extremity of the lateral recess of the fourth ventricle of the human brain, which also has a single median aperture. The two lateral apertures provide a conduit for cerebrospinal fluid to flow from the brain's ventricular system into the subarachnoid space; specifically into the cerebellopontine angle.
- The structure is also called the lateral aperture of the fourth ventricle or the foramen of Luschka. In the brain, the interventricular foramina (or foramina of Monro) are channels that connect the paired lateral ventricles with the third ventricle at the midline of the brain.
- The foramen of Magendie is one of the foramina in the ventricular system and links the fourth ventricle and the cisterna magna. It is one of the three sites that cerebrospinal fluid (CSF) can leave the fourth ventricle and enter the subarachnoid space.
- In the mammalian brain, paired Foramen of Luschka are present on the lateral wall of metacoel.

Therefore, the correct option is A, Foramen of Luschka.

Note: It is to be noted that foramina of Luschka are of import clinically, as their blockage can disrupt the flow of cerebrospinal fluid leading to the development of hydrocephalus.