exam 2: Nervous system lumbosacral plexus Flashcards
As the clinical signs of spinal cord disease are characteristic for each of these regions, animals are considered to have a _________________
region-specific localization
section of spine that consist of C1–5 (neck) is referred to as
cervical
section of spine that consist of C6–T2: thoracic limbs is referred to as
Cervical intumescence
section of spine that consist of T3–L3: trunk is referred to as
Thoracolumbar
section of spine that consist of L4–S3: pelvic limbs and pelvic viscera is referred to as
Lumbosacral intumescence
section of spine that consist of Cd1–5: tail is referred to as
Caudal segments
Thoracic spinal nerves
(T3–T12 segments): Dorsal branches
motor, sensory or both
both
Thoracic spinal nerves
(T3–T12 segments):
what is the motor portion of the dorsal branch? what muscles does it go to?
medial branch
motor for epaxial
sensory for dorsum
Thoracic spinal nerves
(T3–T12 segments):
the dorsal branch splits into the medial branch and ________ branch
lateral branch (cutaneous sensory)
Thoracic spinal nerves: Ventral branch also known as ____________
intercostal nerve
Thoracic spinal nerves
(T3–T12 segments):
Ventral branches = intercostal nerves
these are thoracic spinal nerves 1- ___
12
Thoracic spinal nerves
(T3–T12 segments):
ventral branches-motor portion goes to which muscle
both
motor= external & internal
intercostal mm., transversus thoracis m., and rectus abdominis m
ventral branches-sensory split into what 2 branches
Lateral cutaneous and Ventral cutaneous branch
what is A pointing to? B?
A: Lateral Cutaneous br. from dorsal brs. of thoracic spinal nerves
B: Lateral Cutaneous br. from ventral brs. of thoracic spinal nerves (intercostal nn.)
Lateral Cutaneous brs.
of IC nn. T2,T3 is commonly called
Intercostobrachial nn.
for the Intercostobrachial nn. where should you check for a reaction
tricipital area; not the muscle because the muscle is innervated by the radial nerve
what branch/nerve innervate tricipital and part of axillary regions of thoracic a limb
Lateral Cutaneous brs.
of IC nn. T2,T3. (Intercostobrachial nn.)
name the nerves starting with 1 and moving dorsally
IC n 9.
IC n 10
IC n 11
IC n 12
what is being pointed to
IC n 9
what nerve is located at T13?
is it sensory, motor or both
Costoabdominal n
BOTH
what nerve is associated with L1
sensory, motor, both
Cranial iliohypogastric n.
BOTH
what nerve is associated with L2
motor, sensory, both
Caudal iliohypogastric n
BOTH
what are the nerves that supply to the abdominal wall (3)
Costoabdominal n
Cranial iliohypogastric n.
Caudal iliohypogastric n
what nerve is associated with L4
motor, sensory, both
Lateral cutaneous femoral n. (L4)
sensory only
this is the autonomous zone for what nerve
Lateral cutaneous femoral n. (L4)
what nerve is formed by ventral branches of L3 and
L4 spinal nerves
Genitofemoral nerve
is the Genitofemoral nerve motor, sensory or both
motor and sensory
what is the Genitofemoral nerve motor to
Motor to cremaster m (ONLY IN MALES)
what is the Genitofemoral nerve sensory to
inguinal region
(inguinal mammary gland, prepuce), proximal medial thigh
what nerve is being pointed to
gentiofemoral nerve
what nerve is this the autonomous zone for in males
Genitofemoral nerve
(prepuce and penis)
what nerve is this the autonomous zone for in females
Genitofemoral nerve
(femoral triangle, caudal mammary glands)
what nerve arises from L4, L5, L6 spinal nerves
Obturator n.
what nerve Innervates adductors of pelvic limb:
– External obturator m.
– Pectineus m.
– Gracilis m.
– Adductors
Obturator nerve
the obturator nerve innervates what muscles
adductors of pelvic limb:
– External obturator m.
– Pectineus m.
– Gracilis m.
– Adductors
is there an autonomous zone for the obturator nerve
NO!! (only motor)
what structure does the obturator nerve cross over
obturator foramen
what nerve arises from technically L4, L5, L6 spinal nerves; MAINLY L5
Femoral nerve
what nerve is being pointed to
obturator nerve
what nerve is being pointed to by the red arrow
femoral nerve
what nerve emerges from the iliopsoas m
Femoral nerve
Is the Femoral nerve motor, sensory or both
sensory and motor
what does the motor portion of the femoral nerve go to
Innervates:
– Iliopsoas m.
– Quadriceps femoris m.
– Sartorius m
what nerve innervates
– Iliopsoas m.
– Quadriceps femoris m.
– Sartorius m
femoral nerve
what nerve does the femoral nerve give rise to
saphenous n
this nerve give cutaneous innervation to skin of medial femoral, genual, tibial and
pes regions
saphenous n
what does the saphenous n give skin innervation to
medial femoral, genual, tibial and pes regions
what nerve is the blue arrow pointing to
saphenous n.
what nerve is this
saphenous n.
the red is representing the autonomous zone for which nerve
femoral (distal to femoral triangle)
Caudal cutaneous femoral n. is from which 3 vertebrae
S1, S2, S3
what nerve:
- Follows caudal gluteal a. to level of ischiatic tuberosity
- Terminates in skin on proximal caudal half of thigh
Caudal cutaneous femoral n.
what nerve is this zone for
Caudal cutaneous femoral n.
Formed by ventral branches
of L6,L7, S1, S2
Near greater ischiatic notch
Lumbosacral trunk
what does the Lumbosacral trunk give rise to
– Caudal gluteal n.
– Cranial gluteal n.
– Sciatic n
what gives rise to:
– Caudal gluteal n.
– Cranial gluteal n.
– Sciatic n
Lumbosacral trunk
is the Lumbosacral trunk motor, sensory or both
both
what nerve innervates the Superficial gluteal m.
Caudal gluteal n. (motor only)
what nerve innervates:
Middle gluteal m.
Piriformis m.
Deep gluteal m.
Tensor fasciae latae m
Cranial gluteal n. (motor only)
what muscles does the Caudal gluteal n. innervate
Superficial gluteal m.
what muscle(s) does the Cranial gluteal n. innervate
Middle gluteal m.
Piriformis m.
Deep gluteal m.
Tensor fasciae latae m.
label 1-3
- Sacrotuberal lig.
- Caudal gluteal vessels
- Sciatic n.
label 1 and 2
1.Caudal gluteal n.
2.Cranial gluteal n
is the sciatic nerve motor, sensory or both
motor and sensory
what nerve:
Arises from L6, L7, S1, S2 spinal nerves
- Courses over greater ischiatic notch, dorsal and caudal to the coxal joint.
Sciatic nerve
within the pelvis, what does the sciatic n innervate
– Internal obturator m.
– Gemelli mm.
– Quadratus femoris m
what nerve innervates
– Internal obturator m.
– Gemelli mm.
– Quadratus femoris m
sciatic
Caudal to hip, the sciatic nerve innervates what muscles
– Biceps femoris m.
– Semimembranosus m.
– Semitendinosus m
what nerve innervates:
– Biceps femoris m.
– Semimembranosus m.
– Semitendinosus m
sciatic
what nerves arise from fibular and tibial components of sciatic
n. to supply cutaneous innervation to lateral
and caudal surfaces of crus
Lateral and caudal cutaneous sural nn
Autonomous zones of
which nerve
cutaneous sural nn.
Proximal to the stifle, the sciatic nerve divides into
Common fibular (peroneal) n.
Tibial n
what nerve innervates flexors of the tarsal
joint and extensors of the digit
Common fibular (peroneal) n.
what nerve innervates extensors of the tarsal
joint and flexors of the digit
Tibial n
what does the Common fibular (peroneal) n. innervate
flexors of the tarsal
joint and extensors of the digit
what does the Tibial n innervate
extensors of the tarsal
joint and flexors of the digit
are the two branches of the sciatic( Common fibular (peroneal) n. and tibial n.)
sensory, motor, or both
sensory and motor
label 1-3
- sciatic n
- common fibular
- tibial
what nerve is this
sciatic nerve
identify
Motor branches for:
Biceps femoris m.
Semimembranosus m.
Semitendinosus m
label 1-3
- sciatic n
- tibial n
- Common fibular
(peroneal) n
Tibial nerve branches from what view
plantar view
what nerve arises from L7, S1 spinal nerve
Tibial nerve
is tibial nerve motor? if so, to which muscles
yes
Innervates:
– Gastrocnemius m.
– Superficial digital flexor m.
– Deep digital flexor m.
– Popliteus m
is the tibial nerve sensory? if so, to what?
- Divides into medial and lateral plantar nn.
– Sensory to plantar surface of pes
Deep and superficial fibular (peroneal) nerve branches from what view
dorsal
Common fibular (peroneal) nerve divides into what 2 nerves
- Deep fibular n (sensory and motor)
- Superficial fibular n (sensory and motor)
Superficial fibular n innervates what muscles
– Innervates:
* Lateral digital extensor m.
* Peroneus brevis m
Deep fibular n. Innervates what muscles :
- Cranial tibial m.
- Long digital extensor m.
- Peroneus longus m
which nerve divides into deep and superficial peroneal (fibular) nn
Common fibular (peroneal) n
what nerve branches innervate the extensors
of the tarsal joint and flexors of the digits
Tibial n
what nerve branches innervate the flexors of the tarsal joint and extensors of the digits
Common fibular (peroneal) n
If there is damage to the obturator nerve, what can the animal not do
pectineus, gracillis, adductor:
-ADDuct coxal joint
external obturator:
-rotate limb laterally at coxal joint
if there is damage to the femoral nerve, what can the animal most likely no do
Iliopsoas:
-flex lumbar vertebrae and pelvis/coxal joint
quadricep femoris:
-extend stifle, flex coxal joint
sartorius:
-flex coxal joint
cr: extend stifle
cd: flex stifle
if there is damage to the caudal cutaneous femoral nerve, what can the animal not do
feel caudal half of thigh
if there is damage to caudal gluteal nerve what can the animal not do
superficial gluteal m: extend coxal joint or ABduct pelvic limb
If there is damage to the cranial gluteal nerve what can the animal not do
middle and deep gluteal m:
-extend coxal joint
-ABduct pelvic limb
-rotate pelvic limb
piriformis
-extend coxal joint
tensor fascia lata:
-extend stifle
-flex coxal
-tense fascia lata
If there is damage to the sciatic in the pelvis what can the animal not do
Internal obturator, Gemelli, quadratus femoris:
rotate limb laterally at coxal joint
extend coxal joint
if there is damage to the sciatic nerve caudal to the hip, what cant the animal do
Bicep femoris, semitendinosis, semimembranosis:
extend coxal joint
various stifle actions
extend tarsocrural joint
if there is damage to the common fibular nerve- deep, what cant the animal do
cranial tibial, long digital extensor
flex tarsal joint
extend digital joint
if there is damage to the common fibular nerve- superficial, what cant the animal do
Lateral digital extensor:
extend digital joint at 5th digit
if there is damage to the tibial nerve, what cant the animal do
gastrocnemius:
-flex stifle
-extend tarsocrural joint
SDF:
-flex stifle, metatarsophalangeal, proximal interphalangeal
-extend tarsocrural
DDF:
-extend tarsocrural
-flex metatarsophalangeal, proximal and distal interphalangeal
popliteus m.
-rotate stifle joint medially
