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A&PL: Spinal nerves
A&P: Lab 19
| Question | Answer |
|---|---|
| How many spinal nerves are there | 31 pairs |
| Mixed nerves | bring sensory info from specific information from specific regions of body and at the same time and provide motor outputs to certain muscular regions |
| Dermatomes | Specific sensory input from strips of skin |
| T2-T12 spinal nerves | Contain: Dorsal ramus, ventral ramus, sympathetic motor system branch into rami communicantes (separate ramus) |
| Plexi | Plural form of plexus; complex interwoven network |
| What are the plexus | Cervical, brachial, lumbar, and sacral |
| Regarding ventral rami, Where is the cervical plexus | C1-C5 |
| Regarding ventral rami, Where is the brachial plexus | C5-T1 |
| Regarding ventral rami, Where is the lumbar plexus | T12-L4 |
| Regarding ventral rami, Where is the sacral plexus | L4-S4 |
| Regarding ventral rami, What do C2-C3 control? | Lesser occipital nerve e.g: skin on postero-lateral neck Greater Auricular nerve e.g: Skin on ear, over parotid gland Transverse cervical nerve e.g: skin on anterior/lateral neck |
| Regarding ventral rami, What does C3-C4 control | Supraclavicular nerve e.g: Skin on clavicle/shoulder/anterior chest |
| Regarding ventral rami, What does C3-C5 control? | Phrenic nerve - activates diaphragm it is sole motor nerve supply |
| What are the cutaneous branches and where are they located relative to depth? | Lesser occipital, transverse cervical, greater auricular, supraclavicular located superficially |
| What is part of the motor branches and where are they located relative to depth | Ansa cervicalis (superior and inferior roots), segmental and other muscular branches, phrenic located deep |
| Regarding ventral rami, What does C1-C3 control? | Ansa cervicalis superior and inferior roots e.g: infrahyoid muscles of neck deep |
| What are the infrahyoid muscles | omohyoid sternohyoid sternohyoid |
| What deep nerves are located between C1-C5 | segmental and other muscular branches Deep muscles of neck - geniohyoid - thyrohyoid portions of scalene, levator scapulae, trapezius, and sternocleidomastoid muscle |
| The roots from C5-C1 form what | form trunks, divisions, cords, and peripheral nerves |
| The C5-C1 trunks divide into? What do they provide? | Anterior and posterior divisions, provide cords |
| Musculocutaneous nerve | flexor muscles in anterior brachial aspect of arm; skin on anterolateral forearm |
| Ulnar nerve | flexor muscles in forearm; most intrinsic muscles of hand |
| Median nerve | flexor muscles in anterior forearm and muscles of the palm |
| Radial nerve | posterior muscles of the arm, forearm, hand |
| Axillary nerve | deltoid and teres minor muscles ; some skin of shoulder region |
| What are the nerves of the brachial plexus | musculocutaneous nerve ulnar nerve Median nerve Radial nerve Axillary nerve |
| What nerve is most superficial in the axillary region and thus the first to be compromised in that region | axillary nerve |
| What is brachial plexus injury | injury of nerves between C5-T1 ex: during birth or from motorcycle crash |
| What cord and ventral rami does the axillary region belong to | Posterior cord, C5-C6 |
| What cord and ventral rami does the musculocutaneous nerve belong to | lateral cord, C5-C7 |
| What cord and ventral rami does the median nerve belong to | has 2 branches, 1) medial cord C5-T1 and 2) lateral cord C5-C7 |
| What cord and ventral rami does the ulnar nerve belong to | Medial cord, C8-T1 |
| What cord and ventral rami does the radial nerve belong to | posterior cord. C5-C8, T1 |
| What cord and ventral rami does the Dorsal scapular nerve belong to | branches of C5 rami |
| What cord and ventral rami does the long thoracic nerve belong to | branches of C5-C7 rami |
| What cord and ventral rami does the subscapular nerve belong to | posterior cord; branches of C5-C6 rami |
| What cord and ventral rami does the suprascapular nerve belong to | upper trunk C5-C6 |
| What cord and ventral rami does the pectoral (L and M) nerve belong to | branches of lateral and medial cords |
| What ventral rami does the lumbar plexus run through | T12, L1-L4 |
| What is the purpose of the lumbar plexus | supplies lower abdominopelvic area and lower limbs and has contributions from T12-L4 |
| What is the major nerve in the lumbar plexus and what ventral rami does it run through? | Femoral nerve L2-L4 |
| How many branches does the femoral nerve have | 2, Anterior femoral cutaneous branch Saphenous branch |
| What does the anterior femoral cutaneous branch handle? | cutaneous perception on anterior and medial thigh, motor function to quadriceps/Sartorius |
| What does the saphenous branch deal with | supplies skin on medial leg to the foot |
| What are the ventral rami of the obturator nerve | L2-L4 motor function to medial thigh muscles |
| What are the ventral rami of lateral femoral cutaneous nerve | L2-L3 skin on lateral thigh |
| What is the ventral rami of the Iliohypogastric nerve | L1 |
| What is the ventral rami of the ilioinguinal nerve | L1 |
| What is the ventral rami of the genitofemoral nerve | L1-L2 |
| Sacral plexus nerve runs through | L4-L5 |
| What does the sacral plexus supply | buttocks, posterior thigh, lower leg and foot |
| what major nerve is in the sacral plexus? What are its contributions | The sciatica nerve, which is the largest nerve. L4-L5 and S1-S3 |
| Superior gluteal nerve | L4-S1 gluteus Medius, and minimums muscles |
| inferior gluteal nerve | L5-S2 gluteus maximus |
| posterior femoral cutaneous nerve | S1-S3 skin on buttocks, posterior thigh and popliteal region |
| Pudendal | S2-S4 perineum and external anal sphincter |
| the sciatica nerve diverges where and what does it become | diverges proximal to the popliteal area of the knee tibial nerve: posterior skin of leg, sole of foot, back thigh, leg, and foot, common fibular nerve: anterior leg, dorsum of foot, |
Created by:
cguerrero8
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