Lecture 10-Structures of the Medulla

Question 1

Where is the Medial Longitudinal Fasciculus (MLF) present? Towards where?

Answer 1

Present at all levels of the medulla, towards the midline

Question 2

Describe the movement of the Medial Longitudinal Fasciculus

Answer 2

Moves from dorsal to ventral from superior to inferior medulla

Question 3

Where does the Medial Longitudinal Fasciculus (MLF) originate, and what sensory input does it receive?

Answer 3

The MLF originates in the medial vestibular nucleus and receives sensory input from the vestibular nerve.

Question 4

What is the Medial Longitudinal Fasciculus (MLF), and what are its two main portions?

Answer 4

The Medial Longitudinal Fasciculus (MLF) is a neural pathway in the brainstem. It has both ascending and descending portions.

Question 5

What does the descneding portion of the MLF contain?

Answer 5

Descending portion contains the medial vestibulospinal tract

Question 6

What is the sensory decussation, and which nuclei are involved in this process?

Answer 6

The sensory decussation refers to the crossing of sensory fibers from the nucleus gracilis and nucleus cuneatus via internal arcuate fibers to the contralateral medial lemniscus.

Question 7

In which direction does the sensory decussation occur, and what is the anatomical location of this process?

Answer 7

The sensory decussation occurs dorsomedially (from dorsal to medial). It is located in the brainstem.

Question 8

Where do the sensory fibers go after the decussation, and what is the name of the pathway involved?

Answer 8

After the decussation, the sensory fibers project upwards to the thalamus. This pathway is known as the Dorsal Column-Medial Lemniscus System (DCLMS).