Support Systems Of Head And Neck (3) Flashcards
What does the fluid from the lacrimal gland do?
Moistens and lubricates the surfaces of the cornea and provides nutrients to the cornea
What are the lacrimal glands supplied by?
Parasympathetic nervous system
Sympathetic nervous system
What is the cornea highly sensitive to?
Touch
What is the cornea innervated by?
Cranial nerve 5 (ophthalmic)
What does the sclera provide attachment for?
Extrinsic and intrinsic eye muscles
What is the anterior part of the sclera known as?
White of the eye
What is the iris?
Thin contractile diaphragm with a central aperture (pupil)
What is the pupil?
Central aperture in the iris that allows the transmission of light
What 2 muscles work together to control the size of the pupil?
Sphincter and dilator pupillae
What is the sphincter pupillae controlled by?
Parasympathetic nervous system
How is the sphincter pupillae arranged?
Circularly
What does the sphincter pupillae work to do?
Decrease the diameter of the pupil
What is the dilator pupillae controlled by?
Sympathetic nervous system
How is the dilator pupillae arranged?
Radially
How does the dilator pupillae work?
Increase the diameter of the pupil
What two parts form the retina?
Optic part and non-visual retina
What is the fundus?
Where light entering the eyeball is focused
Why is the optic disk considered a blind spot?
Because it contains no photoreceptors and is insensitive to light
What is the macula?
Has special photoreceptor cones that is specialized for acuity of vision
What is the fovea?
Area of most acute vision
What does the ciliary muscle of the lens do?
Changes the shape of the lens
What does the levator palpebrae superioris do?
Elevates superior eyelid
What are the movements of the superior rectus?
Elevates
Adducts
Medially rotates
What are the movements of the inferior rectus?
Depresses
Adducts
Laterally rotates
What are the movements of the medial rectus?
Adducts
What are the movements of the lateral rectus?
Abducts
What are the movements of the inferior obliques?
Abducts
Elevates
Laterally rotates
What are the movements of the superior obliques?
Abducts
Depresses
Medially rotates
What does the cochlear innervate?
Hair cells of spiral organs
What does the vestibular innervate?
Hair cells in the macula
What are the auditory ossicles?
Malleus
Incus
Stapes
What makes up the fibrous layer of the eye?
Cornea and sclera
What makes up the vascular layer of the eye?
Iris
Pupil
Sphincter and dilator pupillae
What makes up the inner layer of the eye?
Retina
Fundus
Optic disc
Macula
Fovea
What does the tympanic membrane form a partition between?
External acoustic meatus and tympanic cavity of middle ear
