Dermatomes/Myotomes/Reflexes Flashcards
Upper Eyelid and Forehead
CNV1 - supratrochlear nerve
Upper eyelid, frontal sinus, forehead, scalp
CNV1 - Supraorbital nerve
Lateral part of upper eyelid
CNV1 - Lacrimal nerve
Medial parts of both eyelids
CNV1 - infratrochlear nerve
Lower part of dorsum of nose and tip of nose
CNV1 - external nasal nerve
Lower eyelid, side of nose, upper lip
CNV2 - infratrochlear nerve
Upper part of cheek
CNV2 - zygomaticofacial nerve
Anterior part of temporal region
CNV2 - zygomaticotemporal nerve
Upper 2/3 auricle, temporal region
CNV3 - auriculotemporal nerve
Lower part of cheek
CNV3 - buccal nerve
Skin over chin
CV3 - Submental nerve
C2
Occiput
Base of scalp as far as vertex of skull
C2 - Greater Occipital nerve
Skin behind auricle
C2 - Lesser Occipital nerve
Angle of mandible, skin over parotid, lower part of auricle
C2/3 - greater auricular nerve
Anterior neck
C2/3 - transverse cervical nerve
Supraclavicular fossa, upper part of chest, clavicle, upper shoulder
C3/4 - Supraclavicular nerve
C5
Lateral deltoid area, anterior aspect of upper arm
Lateral deltoid
C5/6 - Axillary superior lateral cutaneous nerve (branch of axillary)
Lateral upper arm
C5/6 - Posterior Antebrachial cutaneous nerve (branch of radial)
C6
Anterior-lateral forearm, radial side of hand with thumb and index
Antero-lateral forearm (radial aspect)
C5/6 - Lateral cutaneous nerve of forearm (branch of musculocutanous nerve)
Radial aspect of palm
Palmar cutaneous branch of median n.
palmar aspect of thumb, index, middle and radial aspect of ring fingers
Palmar digital branches of median n.
C7
Middle finger
C8
Ulnar aspect of ring, little finger
Ulnar aspect of palm of hand (from medial aspect of ring)
Palmar cutaneous branch of ulnar n.
Palmar aspect of ulnar half of ring and little finger
Palmar digital branches of ulnar n.
Dorsum of hand, ulnar aspect of ring and little finger
Dorsal branch of ulnar n.
Dorsal aspect of ulnar half or ring and little finger
Dorsal digit nerves
Palmar digital branches of ulnar n.
Dorsum of hand, radial half of ring, middle, index and thumb
Superficial branch of radial nerve
T1
Ulnar half of forearm
Ulnar half of forearm, antecubital fossa, anterior bicep region
C8/T1 - Median Antebrachial cutaneous n. (branch of medial cord of brachial plexus)
T2
Medial aspect of upper arm, upper pectoral and mid scapular area
Medial aspect of upper arm
T1/2 - Medial brachial cutaneous n. (branch of medial cord)
T1/2 - intercosto-brachial nerve. (branch of intercostal nerves)
T4
Nipple
T6
Xiphoid process
T10
Umbilicus
L1
Inguinal region
Inferior to inguinal ligament, overlying femoral triangle
L1 - Femoral branch of genitofemoral
Scrotum
L1 - Genital branch of genitofemoral
Medial aspect of upper thigh
L1 - ilioinguinal nerve
Skin overlying buttock and lateral buttock
L1-3 - Superior cluneal
L2
Middle and lateral aspects of thigh
Anterior and medial aspects of thigh and knee
L2/3 - Anterior femoral branches (branches of femoral nerve)
Lateral aspect of thigh
L2/3 - Lateral femoral cutaneous (branch of lumbar plexus)
L3
Knee
L4
Medial aspect of lower leg
Anterior and medial aspect of lower leg
L3/4 - Saphenous medial crural cutaneous nerve (branches of saphenous, from femoral n.)
L5
Anterio-lateral aspect of lower leg
Anterior lower leg, dorsum of foot
L4-S1 - Superficial peroneal nerve (branch of common peroneal)
Webspace between great and 2nd toe
L4/5 - Deep peroneal nerve (branch of common peroneal)
S1
Lateral aspect of foot, lateral malleolus, posterior ankle
Lateral part of foot, lateral malleolus, posterior ankle and lower leg
L4-S1 - Sural n. (anastomosis of medial dural cutaneous n. from tibial n. & sural communicating n. from common peroneal n.)
Heel
S1/2 - Tibial nerve
Plantar surface of foot, medial aspect
L4/5 - Medial plantar n. (branch of tibial n.)
Plantar surface of foot, lateral surface
S1/2 - Lateral plantar nerve (branch of tibial n.)
Lateral aspect of knee
L4-S2 - Common peroneal lateral dural cutaneous nerve (branch of common peroneal)
S2
Posterior aspect of knee and thigh
Popliteal fossa and posterior thigh
Posterior femoral cutaneous n. (branch of sacral plexus)
S3
Inner/medial buttock
Inner/medial buttock
S1-3 - Middle cluneal
Myotome C5
Deltoid - shoulder abduction
Myotome C6
Elbow flexion, wrist extension
Myotome C7
Elbow extension
Myotome C8
Thumb extension and wrist ulnar deviation
Myotome T1
Finger abduction
Myotome L2
Hip flexion
Myotome L3
Knee extension
Myotome L4
Ankle dorsiflexion
Myotome L5
Big toe extension
Myotome S1
Ankle plantar flexion
Muscle Stretch Reflex
Muscle spindle stretch detected
Action potential fired by Ia afferent fibres
Synapse in spinal cord with alpha-motor-neurones which innervate extramural fibres
Antagonistic muscle is inhibited, agonist muscle contacts
Sensitivity of reflex is regulated by gamma neurones
C5/C6 Reflex
Biceps
C6 Reflex
Brachioradialis
C6/C7 Reflex
Extensor digitorum reflex
C6-C8 Reflex
Triceps
L3/4 reflex
Patella
S1/2
Achilles reflex