11 2 points Which nerve innervates the semispinalis capitis? ? Cervical ? Spinal ? Axillary ? Capitis
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Which of the following nerves is a cutaneous branch of the cervical plexus and contains fibers from the ventral rami of the C2 and C3 spinal nerves? a. Greater occipital nerve b. Transverse cervical nerve c. Medial supraclavicular nerve d. Phrenic nerve
Gil W.
D. Major Nerves from the Cervical and Brachial Plexuses The cervical plexus is formed from the anterior ventral rami of C1-C4 on both the right and left sides of the spinal cord. An important paired nerve from this plexus is the phrenic nerve - relating to the diaphragm (C3-C5), which innervates the diaphragm and is important for breathing. Remember the saying, "Cranial nerves 3, 4, and 5 keep the diaphragm alive." Other cervical nerves mainly supply the scalp, neck, shoulders, and chest. The brachial plexus is formed from the ventral rami of C5-T1. This plexus serves the shoulders and upper limbs. The main nerves that arise from the brachial plexus are the axillary, median, musculocutaneous, radial, and ulnar. Activity 4: Major Nerves from the Cervical and Brachial Plexuses 1. Label the phrenic nerve and the five main brachial plexus nerves in Figure 15.5 using the name of the nerve and the muscles it innervates. Table 15.1 can assist in identification. 2. Identify the nerves from Figure 15.5 on a model or chart. 3. Pronounce the terms as you point to them. (posterior obono) axillary nerve median nerve musculocutaneous nerve phrenic nerve radial nerve ulnar nerve Figure 15.5: Major nerves from the cervical and brachial plexuses.
Adi S.
8. radial n. 9. common fibular n. 10. pudendal n. D. Spinal Nerves Complete the sentences with the correct term about the spinal nerves. 1. The sciatic nerve is composed of two nerves, the Tibial nerve 2. and the common peroneal nerve 3. There are 31 pairs of spinal nerves. 4. The nerve that supplies the posterior thigh sciatic nerve. 5. There is (are) pair(s) of coccygeal nerves. 6. If the anterior (ventral) ramus of a spinal nerve is severed, there is a (motor and/or sensory) loss. 7. There is (are) pair(s) of thoracic nerves. 8. The nerve that supplies the anterior thigh is the 9. There is (are) pair(s) of sacral nerves. 10. There is (are) pair(s) of lumbar nerves. 11. If the posterior (dorsal) ramus of a spinal nerve is severed, the functional loss is (motor and/or sensory). 12. There is (are) pair(s) of cervical nerves. 13. The nerve supplies the deltoid and teres minor muscles. 14. The nerve supplies the triceps brachii muscles and the extensor digitorum longus. 15. The nerve supplies the biceps brachii muscles. 16. The nerve supplies the diaphragm. 17. The nerve supplies most hand muscles. 18. The nerve supplies the flexor carpi radialis.
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