Lecture Tuesday September 18: cranial cavity and superficial face

Characterizing Types of Hematomas
1. Epidural
-between skull and dura
- arterial bleed (usually middle meningeal)
- shaped like a biconvex lens in a CT scan




2. Subdural
- between the dura and arachnoid
- venous bleed (bridging veins that cross the Subdural space)
- crescent shaped in a CT scan




3. Subarachnoid
- bleeding into subarachnoid space
- usually from a ruptured arterial aneurysm
- diffuse blood in the subarachnoid space within the brain parenchyma. Blood in the CSF




Innervation of the Parotid Gland

1. Parasympathetic
- Preganglionic fibers (lesser petrosal nerve) synapse in the Otic Ganglion
- Postganglionic fibers run with the auriculotemporal branch of V3 to the parotid gland
- cause secretion from the gland

2. Sympathetic
- Preganglionic fibers from T1-T3 spinal cord synapse in the superior cervical ganglion.
- Postganglionic fibers follow blood vessels to parotid.
- regulate blood flow (some controversy about secretion, may contribute at some minor level).



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