BIOL lab study notes Flashcards
cervical plexus location
C1-C5
cervical plexus supplying locations
goes to the skins and muscles of the head, neck, superior shoulders, chest and diaphragm
brachial plexus location
C5-T1
brachial plexus nerves
axillary nerve, radial nerve, and ulnar nerve
what does the brachial plexus supply?
the shoulders and upper limbs
lumbar plexus location
L1-L4
lumbar plexus nerve
femoral nerve
what does the lumbar plexus supply?
the anterolateral abdominal wall, external genitals, and parts of the upper limbs
sacral plexus location
L4-S4
sacral plexus nerves
sciatic nerve, tibial nerve, and fibular nerve
what does the sacral plexus supply?
the butt, perineum, and lower limbs
neural plexus
in a plexus, nerve fibres from different spinal nerves are sorted together, so all fibres going to a specific body part are grouped together
sensory neuron neuron type
unipolar
neuroeffector function
located at the synapse between the motor neuron and the effector
sciatic nerve motor location
back of thigh, leg, and foot
axillary nerve motor location
armpit and shoulder (deltoid and teres minor)
radial nerve motor location
arm (triceps), posterior forearm, and hands
femoral nerve motor location
thigh muscles (anterior and lateral) and hip
tibial nerve motor location
lower leg and foot muscles on posterior side
fibular nerve motor location
leg muscles of the anterior and lateral regions
insula
is located deep within the lateral cerebral sulcus (which divides the temporal lobe from the parietal lobe); deep to the parietal, frontal, and temporal lobes
how many cranial nerves are only sensory?
3 (I, II, VIII)
how many cranial nerves are only motor?
5 (III, IV, VI, XI, XII)
how many cranial nerves are mixed?
four (V, VII, IX, X)
where do the cranial nerves originate from?
10 from the brainstem and 2 from the cerebrum (I and II)
3 meningeal layers
dura mater, arachnoid mater, and pia mater
dura mater
contains 2 layers (periosteal and meningeal)
arachnoid mater
middle layer that is avascular, web-like, and contains elastic and collagen
pia mater
adheres to skull and is very vascular; contains elastic and collagen
the canal of schlemm
the junction of the sclera and cornea and where the aqueous humour drains
what is the outer layer of the eye?
the cornea and the sclera and this is a fibrous layer
what is the middle layer of the eye?
made of the choroid, the ciliary body and zonules, and the iris; this is vascular
what is the inner layer of the eye?
made of the pigmented layer (retina) and the neural layer (3 layers: bipolar neurons, ganglion cells, and photoreceptor layer made of rods and cones)
iris components
contains radial (dilate) and circular fibres (constrict) which are smooth muscle, and also some melanin
another name for the inner ear
the labyrinth
oval window
membrane at the base of the cochlea where the stapes attaches
what happens to the eyes when looking at a nearby object?
the ciliary body contracts, the ligaments relax, and the lens becomes more curved
cones in cow’s eye name
tapetum
flow of tears in lacrimal apparatus
lacrimal gland > lacrimal ducts > lacrimal punctum > lacrimal canaliculi > lacrimal sac > nasolacrimal duct