Neurology Flashcards
What bones form the orbits?
Ethmoid Lacrimal Frontal Sphenoid Zygomatic Maxillary Pallatine
What passes through the optic foramen?
The optic nerve and the ophthalmic artery
What passes through the cribriform plate?
Fibres of the olfactory nerve and the anterior ethmoidal nerves
What passes through the superior orbital fissure?
Occulomotor nerve Trochlear nerve Ophthalmic branch of trigeminal nerve Abducent nerve Branch of the inferior ophthalmic vein
What passes through the foramen rotundum?
The maxillary branch of the trigeminal nerve
What passes through the foramen ovale?
The mandibular branch of the trigeminal nerve
What passes through the foramen spinosum?
The middle meningeal artery
What passes through the foramen lacerum?
ICA lies on surface but only cartilage enters
What passes through the carotid canal?
The internal carotid artery
What passes through the internal acoustic foramen?
Facial nerve
Vestibulocochlear nerve
Vestibular ganglion
Labyrtinthine artery
What passes through the jugular foramen?
Glossopharyngeal nerve Vagus nerve Accessory nerve Jugular bulb Inferior petrosal and sigmoid sinuses
What passes through the hypoglossal foramen?
Hypoglossal nerve
What passes through the foramen magnum?
Medulla and meninges
Spinal part of the accessory nerve
Spinal arteries
Vertebral arteries
What are the main contents of the orbits?
Eyeballs Extrinsic occular muscles Ligaments supporting the eye Optic nerve Branches of the internal carotid artery The lacrimal apparatus Orbital fat
What are the component parts of the outer fibrous layer of the eye?
The sclera and the cornea
What are the component parts of the middle vascular layer of the eye?
The ciliary body, the iris and the choroid
What are the component parts of the inner sensory layer of the eye?
The retina
What is the name given to the watery fluid in the anterior segment of the eye?
Aqueous humor
What is the name given to the gel in the posterior segment of the eye?
Vitreous humour
Where is aqueous humor produced?
From the ciliary body
What are the names of the intrinsic muscles of the eye?
The ciliaris, the constrictor pupillae and the dilator pupillae
What group of muscles are responsible for eye movements?
Extrinsic eye muscles
What are the names of the extrinsic eye muscles?
Superior rectus Inferior rectus Lateral rectus Medial rectus Superior oblique Inferior obliqe Levator palpebrae superioris
Describe the innervation of the rectus and oblique muscles of the eye
Lateral rectus innervated by abducent nerve
Superior oblique innervated by trochlear nerve
Medial rectus, superior rectus, inferior rectus and inferior oblique innervated by occulomotor nerve
THINK: SO4, LR6
Which is the only extrinsic muscle not to arise from the posterior aspect of the eyeball?
The inferior oblique
Which ligaments prevent over-adduction and over-abduction of the eye?
The medial and lateral check ligaments
What is the function of the medial and lateral check ligaments?
To prevent over-adduction and over-abduction of the eye
What is the function of the suspensory ligament of the eye?
It helps to stretch the lens
What branch of the internal carotid artery supplies the orbit and the eye?
The ophthalmic
What bones make up the ossicles and within what part of the ear are they found?
The malleus, incus and stapes
Found in the middle ear
What type of joint is found between the ossicles?
Synnovial
Which ossicle is in contact with the tympanic membrane?
The malleus
Which ossicle is in contact with the oval window?
The stapes
What muscles are related to the ossicles?
The tensor tympani and the stapedius
Within what part of the temporal bone do the middle and inner ear lie?
The petrous
What does the chorda tympani carry?
Parasympathetic efferent fibres to submandibular and sublingual salivary glands
Sensory fibres carrying sense of taste to the anterior 2/3 of the tongue
Where do the efferent lymphatics of the jugular lymph trunk drain into?
On the right side- internal jugular vein junction via right lymphatic duct
On the left side- thoracic duct
Which bone forms the posterior boundary of the anterior cranial fossa?
The sphenoid
Which bone forms the anterior and posterior boundaries of the middle cranial fossa?
The sphenoid
Which bones form the anterior and posterior boundaries of the posterior cranial fossa?
Anterior- temporal bone
Posterior- occipital bone