Flashcards in Quiz I: CN I and II Deck (92)
First order neurons of CN I (primary sensory neurons) are called what?
Olfactory neurons (bipolar cells)
Where are Olfactory Neurons located?
Olfactory epithelium lining superior part of the nasal cavity.
What covers the olfactory epithelium?
A thin layer of mucus.
What cells support the olfactory neurons?
What do olfactory "hairs" function as?
Central processes (axons) collected into 10 to 20 olfactory nerves convey information to what?
Are Olfactory neuron axons myelinated?
No, however they are covered by Schwann cells
What bony feature do olfactory nerves pass through, and what bone is this feature found on?
1.) Cribriform Plate
2.) Ethmoid bone
The olfactory nerves enter the olfactory bulb and synapse on dendrites of ____________ cells.
_________ ___________ are formed at the synapses in the olfactory bulb.
What are the secondary sensory neurons of CN I called?
Where are mitral cell bodies located?
Where do mitral cells relay information?
Posterior via the olfactory tract
At the anterior perforated substance, the olfactory tract fibers split into medial and Lateral ______ ______.
Medial and Lateral Olfactory Striae
Medial stria fibers cross the midline via the ________ ___________ and travel to the opposite olfactory bulb.
Lateral stria fibers carry information where? (3 places)
1.) Primary Olfactory Cortex
2.) Periamygdaloid Area
3.) Prepiriform Area (including the Uncus/ BM Area 34) on the medial aspect of the temporal lobe.
T/F Each nostril sends info to both hemispheres?
T/F Each hemisphere receives info from both nostrils?
T/F The Mitral cell synapses at the Thalamus.
False, nowhere in this pathway does synapse occur at the thalamus.
What is the loss of smell called?
Anosmia, this condition is rare
How can skull fractures lead to smell deficits?
Skull fractures can lead to damage of C.N. I, especially if the ethmoid is involved.
How can you determine CSF leakage with a patient?
Presents differently on paper (tissue paper), halo sign will form if CSF is present as the mucus separates from CSF.
What pathway travels from the nasal septum and is autonomic?
What pathway is poorly developed in humans but well developed in animals that track their prey?
What is the sensory organ of vision?
How many layers is the eye composed of?
What is the outermost layer of the eye called?
What does the Fibrous Tunic consist of? (2 parts)
Sclera (white part) and Cornea (clear part)
What is the middle layer of the eye called?