<Lecture Ch 13 HW: The Peripheral Nervous System BIO 168 HW 13 Item 3 Part A What level of the spinal cord supplies the lumbar plexus? ? L4-S3 ? T10-L2 ? L1-L2 ? L1-L4 Submit Request Answer Submit Provide Feedback
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Step 1: The lumbar plexus is formed by the ventral rami of spinal nerves L1-L4. Show more…
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These Pre-laboratory Worksheet questions may be assigned by instructors through their connect course. 1. Which of the following meningeal layers are found in both the brain and the spinal cord? (Check all that apply.) a. arachnoid mater b. dura mater c. pia mater 2. Cerebrospinal fluid bathes the spinal cord by circulating within which of the following? (Check all that apply.) a. central canal b. epidural space c. subarachnoid space d. subdural space 3. Myelinated axons are found in the (gray/white) matter of the spinal cord. 4. Both cranial and spinal nerves are part of the peripheral nervous system. (True/False) 5. Which of the following sections of the spinal cord does not form a nerve plexus? (Circle one.) a. cervical b. lumbar c. sacral d. thoracic 6. Match the common action listed in column A with the corresponding muscle compartment listed in column B. Column A 1. adduction of the thigh 2. dorsiflexion and inversion of the ankle 3. eversion of the ankle 4. extension of the hip, flexion of the knee 5. extension of the knee, flexion of the hip 6. plantar flexion and inversion of the ankle Column B a. anterior compartment of leg b. anterior compartment of thigh c. lateral compartment of leg d. medial compartment of thigh e. posterior compartment of leg f. posterior compartment of thigh 7. Which of the following plexuses is composed of rami, trunks, divisions, and cords? (Circle one.) a. brachial b. cervical c. lumbar d. sacral 8. Match the nerve listed in column A with the corresponding plexus the nerve arises from listed in column B. Column A 1. femoral nerve 2. median nerve 3. phrenic nerve 4. tibial nerve Column B a. brachial plexus b. cervical plexus c. lumbar plexus d. sacral plexus 9. Somatic motor neurons are found in the (anterior/posterior) horn of the spinal cord. 10. Somatic sensory neurons are structurally classified as (bipolar/multipolar/unipolar) neurons. 11. Somatic motor neurons are structurally classified as (bipolar/multipolar/unipolar) neurons.
Adi S.
Spinal Cord & Spinal Nerves LAB ACTIVITY 13: Review & Critical Thinking. Answer the following: 1. (Ascending OR Descending) tracts carry (Sensory Input OR Motor Output) towards the brain. 2. (Ascending OR Descending) tracts carry (Sensory Input OR Motor Output) towards effectors. 3. Which type of neuron(s) is absent in a monosynaptic reflex arc? 4. A person involved in a car accident suffered a complete transection of the spinal cord at the level of C3. Given what you know about the origins of the phrenic nerve, what do you think would be most immediate concern for treating this patient? If the patient survives, what would be the major long-term consequence of their injury? 5. Shingles is a painful, localized rash caused by reactivation of the virus that causes chickenpox in childhood. Explain why shingles usually affects a smaller area of skin than does the initial chicken pox infection. (HINT: Your answer should include the word "dermatome".)
Sensory homunculus: Identifying the four labeled skin regions, A, B, C, and D, based on your ranking of sensory receptor density. Two-Point Discrimination Test Area of Skin Distance between Compass Points at Which Two-Point Discrimination Can Be Made (mm) Relative Density of Sensory Receptors (ranked 1 to 4) A 5.0 mm B 3.2 mm C 8.6 mm D 1.5 mm Provide a rationale for your answers. 13. The following peripheral nerves are derived from the lumbar plexus: Peripheral Nerve Spinal Nerve Contributions Ilioinguinal nerve L1 Genitofemoral nerve L1, L2 Lateral femoral cutaneous nerve L2, L3 Femoral nerve L2, L3, L4 A functional assessment of the spinal nerves that form the lumbar plexus indicated a functional loss of spinal nerve L2 on the right side. How would this condition affect the nerves listed in the table? Would each nerve be equally affected? Explain your answer.
Madhur L.
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