Skeletal Muscle vs. Dense Regular Connective Tissue (tendon)

One more time….

Tendon

Skeletal muscle

Muscle Fiber Types

Cross Section of Skeletal Muscle Stained for Myoglobin-Type I Fibers (aka. Red Fibers, Slow Oxidative): Darkly staining b/c more myoblobin, slow twitch, fatigue resistant, but generate less tension-Type IIa Fibers (aka. Intermediate fibers, fast glycolytic oxidative fibers): Variable staining, fast-twitch, fatigue resistant, capable of anaerobic glycolysis- Type IIb Fibers (aka. White Fibers, Fast Glycolytic): Lightest staining, fast-twitch, fatigue prone, lots of glycogen, low myoglobin, round, large

White Red

Nerve Stuff

Motor End Plate-where black staining nervescontact muscle -looks like the rubber part of a plunger

Motor End Plates

Peripheral Nerves: -In the accurate words of the legendary Dr. Boggus:“Circle of wavy shit”

Peripheral Nerves: -Endonuriem: around each axon-Perinuriem: around each peripheral nerve-Epinuerium: around each bundle of peripheral nerves

Peripheral Nerves: -Endonuriem (EN): around each axon-Perinuriem (P): around each peripheral nerve -Epinuerium(EPI): around each bundle of peripheral nerves

*from demo on blackboard

Peripheral Nerve: Longitudinal Section -Field of bubbly wavy shit-Nodes of Ranvier are the short vertical lines b/w Shwann cells (ie the ties b/w the sausage links)

Myelinated Nerve: -Nuerilemma: surrounds the myelinated cells-Node of Ranvier: the dark line b/w Shwann cells where the nuerilemma appears pinched.

Axon MyelinMyelin

Myelinated Nerve: -Myelin sheath is stained black (the small black circles)

Ganglion: -Looks like a bunch of FRIED EGGS-DON’T confuse this with peripheral nerve (circle of W.S.)! In a peripheral nerve cross section, the dark spot is an axon, not a nucleus w/ a nucleolus, and the white of the egg is a pale myelin sheath with a dark outline as opposed to cell cytoplasm.

Ganglion vs. Peripheral Nerve

-I spy a nucleolus!

-Lots of satellite cells!

Ganglion Peripheral Nerve

-Darkish staining cytoplasm in neurons that tendsto look shrunken/pull away from surroundings(ie white space)

-Fried eggs -Circle of W.S.

-Dark axons surrounded by pale myelin sheaths with darkeroutlines