Reflexes

What spinal nerves are involved in the Quadriceps (patellar) reflex?

L4-L6 and femoral nerve.

What nerves does the cranial tibial reflex test

L6-L7 and peroneal branch of the sciatic.

What spinal nerves correspond to the Gastrocnemius Reflex?

L7-S1 and tibial branch of the sciatic.

In which type of neuron injury is the flexor withdrawal response absent?

Absent in Lower Motor Neuron (LMN) injuries but present with Upper Motor Neuron (UMN) injuries.

What spinal nerves are involved in the Biceps Reflex?

C6-C8 and musculocutaneous nerve.

What is the spinal nerve range for the Triceps Reflex?

C7-T1 and radial nerve.

What spinal nerves are associated with the Extensor carpi radialis reflex?

C7-T1.

What reflex is normal in young animals and can be elicited with an UMN lesion?

Crossed extensor reflex.

Which spinal nerves are involved in the Cutaneous trunci reflex?

C8-L4.

What is the relationship between the lesion and the absence of a reflex in the Cutaneous trunci reflex?

Lesion is within 2 vertebrae of absent reflex.

What nerves are involved in the Pupillary Light Reflex?

Sensory: Optic (CN2); Motor: Parasympathetic oculomotor (CN3).

What condition is associated with Mydriasis?

Parasympathetic denervation of CN3.

What causes Miosis?

Sympathetic denervation (Horner’s syndrome).

What sensory and motor components are involved in the Physiologic Nystagmus?

Sensory: Vestibular CN 8

Motor: CN 3, 4, 6.

What are the sensory and motor pathways involved in the Menace Response?

Sensory: CN 2

Motor: CN 7.

Which cranial nerves are involved in the Palpebral Reflex sensory and motor?

Sensory: CN 5 (trigeminal)

Motor: CN 7 (facial).

What cranial nerves are involved in the Gag Reflex?

Glossopharyngeal and vagus (CN 9 and 10).

What cranial nerves are involved in the Corneal Reflex and Retractor Bulbi Reflex?

Sensory: CN 5 (trigeminal)

Motor: CN 7 (facial) and CN 6 (abducens).