Anatomy 2- Orbital Autonomics Flashcards
(67 cards)
Where does CNV1 supply?
Upper eyelid, cornea, conjunctiva, skin of the root/bridge, tip of nose
Where does CNV2 supply?
Skin of the lower eyelid, maxilla, ala of nose, upper lip
Where does CNV3 supply?
Skin over the mandible and TMJ joint
What supplies the angle of the mandible?
C2/3 spinal nerves
The supra/infraorbital nerves are branches of what?
Supraorbital- CNV1, infraorbital- CNV2
In the blink reflex, something touches the cornea, and APs are conducted via what nerves to where?
From the cornea to the trigeminal ganglion via CNV1 branches. Then along CNV to the pons.
In the blink reflex, central connections are made at the CNS between what two nerves?
CNV and CNVII
In the blink reflex, what happens after connections have been made at the CNS?
APs are conducted via CNVII to the palpebral part of orbicularis oculi
In the skin, what type of innervation is found in the arterioles, sweat glands and arrestor muscles?
Sympathetic
Does the brain have motor function?
No
The anterior surface of the eyes are sensitive to touch. What nerve is responsible for this?
CNV1
Where do sympathetic axons originate from and where do they pass to?
Originate from autonomic centres in the brain and pass down the spinal cord
Where do sympathetic axons exit the spinal cord and where do they pass to?
They exit at T1-L2 spinal nerves (thoracolumbar outflow) and pass into the sympathetic chain
Where do sympathetic axons pass into from the sympathetic chain?
All spinal nerves (anterior and posterior rami) and then into splanchnic nerves to supply all organs
All anterior and posterior rami will have what 3 types of innervation?
Somatic motor, somatic sensory and sympathetics
Where do presynaptic sympathetic axons from the CNS synapse? What do they then become?
They synapse at the superior cervical ganglion to become postsynaptic sympathetic axons
How do postsynaptic sympathetic axons get to the orbit?
They enter the internal/external carotid nerves and then pass onto the internal/external carotid arteries where they are carried to the organs of the head. The ophthalmic artery carries them into the orbit.
Where do parasympathetic axons leave the CNS?
Cranial nerves III, VII, IX and X and via sacral spinal nerves (craniosacral outflow)
What do parasympathetics supply?
Internal organs
Where in the head receives parasympathetic supply?
Eye, lacrimal gland and salivary glands
What does the vagus nerve supply?
Organs of the neck, chest and abdomen as far as the midgut
Sacral spinal nerves carry parasympathetic nerves to where?
Hindgut, pelvis and perineum
What is CNIII?
Oculomotor nerve
Where does CNIII attach with the CNS?
The junction between the midline and pons and passes through the cavernous sinus
