Endoneurium

Perineurium

Epineurium

Radial three and a half digits on palm and tips of radial three and a half digits on dorsum

lateral surface of thumb on palm and thumb and half of digits 2 & 4 on dorsum

Medial two digits on dorsum and medial one and a half digits on palm

Wrist drop

Clawing of the hand that is most pronounced in medial fingers

Dupuytren's contracture

Radial three and a half digits on palm

medial half of thumb on dorsum and distal half of digits 2 and three

medial one and a half digits on dorsum

Medial one and a half digits on palm

Compression causes pressure gradient so tissue redistributes to areas of lower pressure

Degeneration of nerve into segments

Nerve demyelinates forming saltatory compartments

thins epineurium so pain felt first

Causes demyelination which results in a proliferation of schwann cells and so causes re myelination

Fibrosis results in scarring which reduces glide and so causing nerve traction

causes pressure gradients so tissue redistributes to areas of lower pressure

death of proximal CNS neurone resulting in complete paralysis

Degeneration of axon following ischaemic damage

Apoptosis of part of axon distal to injury followed by schwann cell alignment for axon regeneration

Palmar apponeurosis

Extensor pollicis longus

Hypothenar muscles and medial lumbricals

Lateral lumbricals and thenar muscles

10: two to every digit

9: 1 to the thumb and two to each finger

5: one to every digit

8: two to each finger

Hyperextension of index fingers

Weakness

Pins and needles

Night symptoms

Wrist drop

Dupuytren's contracture

Medial

Posterior

Lateral

Thenar muscles

Adductor pollicis brevis

Radial lumbricals

Abductor pollicis brevis

Hypothenar muscles

interossei

ulnar lumbricals

Guyon's canal and wrist drop

Guyon's canal and dupuytren's contracture

Carpal tunnel and dupuytren's contracture

Carpal tunnel and wrist drop

Compression of radial nerve in Guyon's canal

Compression of median nerve in carpal tunnel

Compression of ulnar nerve around medial epicondyle

Compression of ulnar nerve in Guyon's canal

Medial

Posterior

Lateral