PNS Somatic Organisation¶

From Skin to Spine

graph TD 
    1[Pain] ==>X1[Free Nerve Endings];
    2[Light Touch and Vibration] ==> X2[Meissner's Corpuscle]; 
    3[deep Touch vibration] ==> X3[Pacinian Corpuscle];
    4[Torque,stretch] ==> X4[Rufinni Corpuscle];
    Y{Dorasal root Ganglian};
    X1 ==> Y;
    X2 ==> Y;
    X3 ==>Y;
    X4 ==> Y;
    Y ==> z[Dorsal horn of spinal Cord];
    z ==> za[Internurons];
    za ==>|DANger | qa1; 
    za ==>zb[Speific Spinal Tracts];
    zb ==>zb1[Cortex of Brain];
    Q{Motor Commands from Upper Motor Neuron} ==>|via| qa[Cortico-Spinal Tract];
    qa ==>qa1[<mark>Cell body of :octicons-arrow-down-24:er Motor Neuron on Ventral Horn</mark>];
    qa1 ==>|axon of LMN| qa1a[leaves Ventral horn and Branches to form Motor ENd Plate];
    qa1a ==>|release Ach| qa1a1[Muscle Contraction];

Dorsal Root Ganglion¶

No neutrophil
Round Cell body with Satellite cells Surrounding

er Motor Neuron¶

- No satellite Cells surrounding

Nerve vs Roots¶

Nerves = Sensory ,Motor ,Automoic Roots = Only Sensory / Motor

graph TD
    X{Region of Body} ==>|has| x1[Skeletal Muscle];
    X ==> x2[Smooth Muscle];
    X ==> x3[SEnsory Nerve Endings];
    x1 ==>|innervated by| x1a[Axon of :octicons-arrow-down-24:er Motor Neuron];
    x2 ==>|innervated by| x2a[Axon of PSM/SM ];
    x3 ==>|innervated by| x3a[Axons of Dorasal Root Ganglion];
    Z[(Nerve)];
    x1a ==>Z;
    x2a ==> Z;
    x3a ==> Z;
    Z ==>|<mark> Near SPinal Cord separates </mark>| za[(Dorsal Root)];
    Z ==>|<mark> Near SPinal Cord separates </mark>| zb[(Ventral Root)];
    zb ==> zb1[Vental horn of Spinal Cord];
    za ==> za1[Dorsal Root Ganglian of Sensory Nerves];
    za1 ==> za2[Dorsal Horn of Spinal Cord];

Covering of Nerves;¶

Endo-neurium = Connective Tissue Covering individual Axons
Peri- Neurium = COvering Bundle of axons
Epi- Neurium = Covering a Nerve