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Neuroglia of PNS:

_Schwann cell

_Satellite cell

Neuroglia cells of :

_Astrocyte

_Oligodendroglia

_Microglia

_Ependymal

🎀cleftsof Lanterman

🎀a single schwann cell mylinated one internodal segment

A single oligodendrocytes mylinated several internodal segment

🎀 Nerve trunk

- epineurium outer layer

- perineurium middle layer

- endoneurium inner layer

-perineurium form blood nerve barrier➡️ by squamous cell joined by tight junctions and surround by a basal lamina

🎀 Astrocytes

- macroglia

- perivascular rnd feet

- blood brain barrier

🎀 Oligodendrocytes

- myelin in brain

🎀 Microglia

-phagocytic cell

🎀 Ependymal cell

- line central canal , ciliated

🎀 In hemiplegia the muscles of upper part of face and the mastication and pharynx not affected ? Because lateral corticobulber tract receive fibers from both right and left cerebral corte

🎀 Exra pyramidal single tract

_olivo spinal

_rubro spinal

_ suco marginal

🎀 Exra pyramidal paired tract

_reticulo spinal

_vestibulo spinal

_tecto spinal

🎀 Ventral spinocerebellar tract pass through unferior cerebellar peduncle

🎀sulcomarginal tract continuation of spinal liminiscs

🎀 medial corticobulber tract controle movement of eyes

🎀 In syringomyelia pain & touch are lost but crude touch preserved ? As it carry by gracil & cuneate

🎀 Blood brain barrier:

1_endothelial cells

2_thick basal laminae

3_The end feet of numerous astrocytes

🎀 corneal layers

1_ outer epithelium

2_ bowmman's membrane

3_substantia propria

4_ Descemet's memberaion

5_ Descemet endothelium

🎀 Destrot in bowmann's : corneal opacity

🎀 Descemet's memberaion: continuous withdrawal of water from corneal stroma

🎀 Corneal transplant succeeds : as it avascular

🎀 Component of bruch's membrane1_Basal lamina of choriocapillary layer

2_Collagenous bundle layer

3_Central network of elastic fibers.

4_Collagenous bundle layer

5_Basal lamina of retinal pigment epithelial cell

🎀 Refractive media of the eye

1_Cornea

2-Aqueous humor

3-Vitrous body

4-Lens

Histology