Session 1: Intro to Nervous System - Embryology Flashcards
What does the neural tube develop into?
The CNS: spinal cord and the brain
What is formed by the neural crest cells?
PNS. Includes dorsal root ganglia cells, schwann cells, and the ganglia of the ANS (sensory and postganglionic motor cells). Also forms the melanocytes in stratum basal of epidermis
The neural tube is divided into what four plates?
Roof
Floor
Alar
Basal
Where is the alar plate located?
Dorsal to the sulcus limitans
What does the alar plate form?
The sensory and association part of the developing neural tube
Where is the basal plate located?
Anterior to the sulcus limitans
What does the basal plate form?
The motor part of the developing neural tube, including both alpha and gamma motor neurons
What makes the roof and floor plates different from the basal and alar plates?
The roof and floor plates do not generate any neuronal components
What separates the alar and basal plates?
A groove in the wall of the neural tube (oriented in the coronal plane), known as the sulcus limitans
Where is the sulcus limitans present?
In the developing cord and into the brain system, but only as far as the developing midbrain
From which end does the neural tube expand during development?
The rostral end
What primary vesicles are formed by the developing neural tube?
Rhombencephalon, mesencephalon, and proencephalon
What secondary vesicles are formed from the rhombencephalon?
Myelencephalon and metencephalon
What secondary vesicles are formed from the prosencephalon?
Diencephalon and telencephalon
What brain region(s) is formed by the myelencephalon?
Medulla (oblongata)
