Week 7 somatic nervous system

Combing for for eyelid

Blephar/o

Phak/O

Lens

Combing form meaning hearing

Audi/o and acous/o

Term that means dilation of the pupil

Mydriasis

Meaning of cross eye

Strabismus’s

Medical term for nearsightedness

Myopia

Term for farsightedness

Hyperopia

Medical term for earache

Otalgia

Conditions that contains a word root meaning eardrum

Tympanitis

Intrinsic reflex is defined as:

A reflex that occurs within the CNS, involving processing and response through the nervous system.

Visceral reflex is defined as

An automatic/involuntary reflex involving internal organs, such as heart rate, digestion, or blood vessel diameter.

The conjunctiva

A thin mucous membrane that lines the inside of the eyelids and covers the anterior surface of the sclera.

The choroid layer

The middle, vascular layer of the eye that contains blood vessels and supplies nutrients to the eye.

Olfaction

The sense of smell.

Electrochemical signals

Signals used by neurons to communicate, involving electrical impulses and chemical neurotransmitters.

Neuromuscular junction

The junction between a motor neuron and a skeletal muscle fiber, where the nerve communicates with the muscle.

Anterior cavity of the eye is filled with:

Aqueous humor

Posterior cavity of the eye is filled with:

Vitreous humor

Osmoreceptors

Sensory receptors that detect changes in the concentration of solutes/water balance in body fluids.

Tongue papillae

Small projections on the surface of the tongue that help with taste and/or moving food. Some contain taste buds.

Olfactory epithelium

Specialized sensory tissue located in the upper part of the nasal cavity that contains receptors for smell.

Olfactory bulb

A structure at the front of the brain that receives and processes information about smell from the olfactory receptors.

Auricle of the ear

The visible external portion of the ear that collects and directs sound waves into the ear canal.

Also called: pinna.

Tympanic membrane

The eardrum. A thin membrane that vibrates in response to sound waves

Ossicles

Three tiny bones in the middle ear:

Malleus → Incus → Stapes

Memory trick: MIS

They transmit and amplify sound vibrations toward the inner ear.

Static equilibrium

The sense of head position relative to gravity and changes in linear movement.

Think: standing still, tilting your head, or moving straight up/down.

Dynamic equilibrium

The sense of rotational/angular movement of the head.

Think: spinning or turning your head.

The eye is composed of three layers (tunics). From superficial to deep

1. Fibrous tunic

• Sclera

• Cornea

2. Vascular tunic (uvea)

• Choroid

• Ciliary body

• Iris

3. Neural tunic

• Retina

Sensory receptor

A cell or structure that detects a specific type of sensation and sends information to the nervous system.

Baroreceptors

Sensory receptors specialized to detect pressure/stretch, especially changes in blood pressure.

Retina

neural tunic

Choroid

vascular tunic