Comparison between tract and nerve

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  Comparison between tract and nerve Nerve Nerve contain bundle of axons (nerve fibers) in the peripheral nervous system (PNS) that transmits signals between the central nervous system (CNS) and other parts of the body. It is the most important part of peripheral nervous system Location: Peripheral nervous system. Structure: Made of axons, connective tissue layers (endoneurium: axon is surrounded by it , perineurium: bundle of axons are surrounded by it, epineurium: whole nerve trunk is surrounded by it), and blood vessels. It gets myelination by Schwann cell   Function: Carries sensory signals to the CNS (afferent) from peripheral part of body or motor signals carry from from the CNS (efferent) to target organs like skeletal muscle, cardiac muscle, smooth muscle or glands Example: Sciatic nerve, median nerve, except optic nerve (though optic nerve is technically part of CNS in develop...
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Difference between alar plate and basal plate of the mantle layer of neural tube

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Difference between alar plate and basal plate of the mantle layer of neural tube

Alar plate

Basal plate

The alar plates (or alar lamina) is a neural structure in the embryonic nervous system. Sensory area in the dorsal region of the spinal cord and brain

In the developing nervous system, the basal plate is the region of the neural tube ventral to the sulcus limitans

they develops from dorsal aspect of mantle layer of neural tube

they develops from ventral  aspect of mantle layer of neural tube

Functional components deal by alar plate :

  Cells within the alar plate develop into afferent and interneurons. The alar plate further develops general sensory afferents (GSA) innervating the skin, special sensory afferents (SSA) innervating the branchial arch derivatives, and visceral sensory afferents (VSA) innervating the respiratory, cardiac, and gastrointestinal systems.

Functional components deal by basal plate :

 Cells within the basal plate develop into efferent neurons. The basal plate also further develops general motor efferents (GME) innervating somatic muscles, special motor efferents (SME) innervating branchial arch-derived muscles, and visceral motor efferents (VME) innervating autonomic (respiratory, cardiac, and gastrointestinal system) muscles.

Structures derived from alar plate :

1. dorsal gray matter of the spinal cord,

2. the sensory nuclei of cranial nerves V, VII, VIII, IX, and X.

3. The inferior olivary nucleus, mesencephalic nucleus of V, and main sensory nucleus of V are also developed from this plate.

4.  the rhombic lip of the alar plate develops the cerebellum, which is considered to be a big exception since alar plate gives rise to sensory derivatives only.

Structures derived from basal plate :

·         oculomotor nucleus: somatic motor nucleus for the oculomotor nerve

·         Edinger-Westphal nucleus: general visceral motor (parasympathetic) nucleus for the oculomotor nerve,

·         trochlear nucleus somatic motor nucleus for the trochlear nerve

·         motor nucleus of CN V: somatic motor nucleus for the trigeminal nerve

·         ​ nucleus for the trigeminal, facial, glossopharyngeal and vagus nerves

·         abducent nucleus: somatic motor nucleus for the abducens nerve

·         facial nucleus: special visceral motor (branchial) nucleus for the facial nerve

·         superior salivatory nucleus: general visceral motor (parasympathetic) nucleus for the facial nerve

·         inferior salivatory nucleus: general visceral motor (parasympathetic) nucleus for the glossopharyngeal nerve

·         ambiguus nucleus: special visceral motor (branchial) nucleus for the glossopharyngeal and vagus nerves

·         dorsal motor nucleus: general visceral motor (parasympathetic) nucleus for the vagus nerve

·         hypoglossal nucleus: somatic motor nucleus for the hypoglossal nerve

 

Comments

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March 21, 2022 at 1:04 PM
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