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Sensory Innervations Skin posterior to auricle Lesser occipital - C2,3 – cervical plexus Skin over lateral portion of occipital region Lesser occipital – C2,3 – cervical plexus Skin over parotid salivary gland Greater auricular – C2,3 – anterior branch – cervical plexus Skin over mastoid process Greater auricular – C2,3 – posterior branch – cervical plexus Skin over ear lobe Greater auricular – C2,3 – posterior branch – cervical plexus Skin over anterior neck Transverse cervical – C2,3 – cervical plexus Skin from clavicle to midline Supraclavicular – C3,4 – medial branch – cervical plexus Skin of anterior chest wall Supraclavicular – C3,4 – intermediate branch – cervical plexus Skin over the shoulder Supraclavicular – C3,4 – lateral branch – cervical plexus Skin to posterior scalp Greater occipital – dorsal ramus C2 Third occipital – dorsal ramus C3 – media branch (small area) Skin of lateral forearm Lateral antebrachial cutaneous of musculocutaneous – C5,6,7 – brachial plexus – lateral cord Skin of medial aspect of forearm Medial antebrachial cutaneous – C8,T1 – brachial plexus – medial cord Skin of posterior aspect of forearm Medial antebrachial cutaneous – C8,T1 – brachial plexus – medial cord Radial – C5,6,7,8,T1 – brachial plexus – posterior cord Skin of medial arm Medial brachial cutaneous – C8,T1 brachial plexus – medial cord Skin of posterior arm Medial brachial cutaneous – C8,T1 – brachial plexus – medial cord Radial – C5,6,7,8,T1 – brachial plexus – posterior cord Skin of medial hand Ulnar – C8,T1 – brachial plexus – medial cord Skin of little finger Ulnar – C8,T1 – brachial plexus – medial cord Skin of MEDIAL half of ring finger Ulnar – C8,T1 – brachial plexus – medial cord Lateral 2/3’s hand and finger Medial root of median – C8,T1 – brachial plexus – medial cord Radial – C5,6,7,8,T1 – brachial plexus – posterior cord Tips of thumb Tips of index fingers Tips of middle finger LATERAL aspect of tip of ring finger Skin over deltoid Skin over proximal and middle phalanges Skin of upper medial aspect of the thigh Root of penis Root of scrotum Labia majora Mons pubis Skin of lower abdomen and buttock Skin of middle anterior surface of thigh Skin of anterior thigh Skin of medial aspect of thigh Skin of medial aspect of leg Skin of medial aspect of foot Skin over lateral thigh Skin over plantar surface of foot Skin of posterior leg Skin over distal 1/3 of anterior aspect of leg Skin of dorsum of foot Medial root of median – C8,T1 – brachial plexus – medial cord Medial root of median – C8,T1 – brachial plexus – medial cord Medial root of median – C8,T1 – brachial plexus – medial cord Medial root of median – C8,T1 – brachial plexus – medial cord Axillary – C5,6 – brachial plexus – posterior cord Radial - C5,6,7,8, T1 – brachial plexus – posterior cord Iliolinguinal – L1 – lumbar plexus Femoral L2,3,4 – lumbar plexus Ilioinguinal – L1 – lumbar plexus Ilioinguinal – L1 – lumbar plexus Genitofemoral – L1,L2 – femoral branch – lumbar plexus Ilioinguinal – L1 – lumbar plexus Genitofemoral – L1, L2 – femoral branch – lumbar plexus Ilioinguinal – L1 – lumbar plexus Iliohypogastric – L1 – lumbar plexus Genitofemoral – L1,2 – femoral branch – lumbar plexus Femoral – L2,3,4 – lumbar plexus Femoral – L2,3,4 – lumbar plexus Lateral cutaneous femoral – L2,3 – lumbar plexus Saphenous n. – L2,3,4 – off femoral nerve – lumbar plexus Obturator n. – L2,3,4 – lumbar plexus Femoral n. – L2,3,4 – lumbar plexus Saphenous n. – L2,3,4 – off femoral nerve – lumbar plexus Saphenous n. – L2,3,4 – off femoral nerve – lumbar plexus Lateral cutaneous femoral – L2,3 – lumbar plexus Medial and lateral cutaneous nn. – L4,5,S1,2,3 – off tibial n. – sacral plexus Cutaneous sensory – tibial n. – L4,5,S1,2,3 – sacral plexus Superficial peroneal n. – of Common peroneal n. – L4,5,S1,2,3 – sacral plexus Superficial peroneal n. – of Common Skin of the penis and scrotum in male; labia majora and minor and vagina in female Skin over coccyx peroneal n. – L4,5,S1,2,3 – sacral plexus Deep peroneal n. – of common peroneal n. – L4,5,S1,2,3 – area of skin between the 1st and 2nd toes – sacral plexus Pudenal nerve – S2,3,4 – sacral plexus Coccygeal plexus – S(4),5,Cy1
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