II. Images: Dermatomes

III. Exam: Pearls - Cold Sensation testing

  1. Use syringe filled with Alcohol and blunt needle
  2. Spray skin at each Dermatome level
  3. Patient should feel cold Sensation

IV. Exam: Dermatomes - Upper body Sensory Innervation

  1. Mnemonic: C4-Clavicle, T4-Nipple Line, T10-Belly Button, L1-Inguinal
  2. C1-2: Occipital and parietal region Sensation
  3. C3: Lower pinna, posterior cheek, temporal region and lateral neck
  4. C4: Dermatome along Scapular spine, mid-deltoid and clavicle
  5. C5: Deltoid, Lateral Upper Arm and Forearm
  6. C6: Thumb, Index Finger, lateral Forearm (Radial Nerve) - dorsal first web space
  7. C7: Index, Middle and Ring Fingers, triceps (Median Nerve) - thenar eminence
  8. C8: Middle, Ring and Little Finger (pinky), medial Forearm (Ulnar Nerve) - hypothenar eminence
  9. T1: Ulnar hand, axilla to olecranon
  10. T4: Nipple
  11. T8: Xiphoid
  12. T10: Umbilicus
  13. T12: Symphysis

V. Exam: Dermatomes - Lower body Sensory Innervation

  1. L1: Inferior to iliac crest
  2. L3: Anterior and medial thigh down to knee
  3. L4: Anterior low leg and medial foot
  4. L5: Lateral leg, heel, dorsal foot, space between 1st and second toes
  5. S1: Posterior leg, lateral Foot, dorsal fifth toe
  6. S3: Ischial tuberosity area
  7. S4-5: Perianal region

Images: Related links to external sites (from Bing)

Related Studies

Ontology: Afferent neuron (C0027883)

Definition (MSH) Neurons which conduct NERVE IMPULSES to the CENTRAL NERVOUS SYSTEM.
Definition (MSHCZE) Neurony vedoucí nervové impulsy směrem do CENTRÁLNÍHO NERVOVÉHO SYSTÉMU.
Definition (NCI) Neurons which convey sensory information centrally from the periphery. (MeSH)
Concepts Cell (T025)
MSH D009475
English Afferent Neuron, Neuron, Afferent, Neurons, Afferent, Afferent Neurons, Sensory neuron, Afferent neuron, afferent neurons, sensory neuron, afferent neuron, sensory neurons, Sensory Neurons, Sensory Neuron, Sensory Cell Afferent Neuron
French Neurones afférents, Neurone afférent
Swedish Nerver, inåtledande
Czech neurony aferentní
Finnish Tuovat hermosolut
Latvian Aferentie neironi, Neironi, aferentie
Polish Neurony dośrodkowe, Neurony aferentne
Japanese 感覚ニューロン, 求心性ニューロン, 輸入ニューロン, 輸入ノイロン, ニューロン-輸入
Norwegian Tilførende nerver, Nevroner, afferente, Afferente nevroner, Nerver, tilførende, Neuroner, afferente, Afferente neuroner
German Neuronen, afferente, Neuronen, sensorische
Italian Neuroni afferenti
Dutch Neuronen, afferente, Neuronen, sensore
Portuguese Neurônios Aferentes
Spanish Neuronas Aferentes

Ontology: Sensory nerve (C0501385)

Definition (FMA) General anatomical term applied to nerves in which somatic afferent nerve fibers predominate.
Definition (CSP) sensory nerves bringing impulses toward the central nervous system.
Concepts Body Part, Organ, or Organ Component (T023)
English afferent nerve, Sensory nerve, Nervus sensorius, nerve sensory, nerves sensory, sensory nerve, afferent nerves

Ontology: skin sense (C0678900)

Definition (PSY) Any of the senses, such as pressure, pain, warmth, cold, and touch, whose receptors lie within or beneath the skin or in the mucous membrane.
Concepts Organ or Tissue Function (T042)
English cutaneous sense, senses skin, skin sense, sense skin, Cutaneous Sense

Ontology: Touch sensation (C0702221)

Definition (MSH) Sensation of making physical contact with objects, animate or inanimate. Tactile stimuli are detected by MECHANORECEPTORS in the skin and mucous membranes.
Definition (GO) The series of events required for an organism to receive a touch stimulus, convert it to a molecular signal, and recognize and characterize the signal. This is a neurological process. The perception of touch in animals is mediated by mechanoreceptors in the skin and mucous membranes and is the sense by which contact with objects gives evidence as to certain of their qualities. Different types of touch can be perceived (for example, light, coarse, pressure and tickling) and the stimulus may be external or internal (e.g. the feeling of a full stomach). [GOC:ai]
Definition (NCI) The faculty of touch, the sensation produced by pressure receptors in the skin.
Definition (PSY) Awareness of the qualities or characteristics of objects, substances, or surfaces by means of touch.
Definition (CSP) group of senses by which contact with objects gives evidence as to certain of their qualities, as registered by mechanoreceptors in the skin and mucous membranes.
Concepts Organ or Tissue Function (T042)
MSH D014110
SnomedCT 70761002, 397624008
LNC LP30265-0, MTHU001444
English Touch, Touch sensation, touch, tactile sense, taction, tactition, perception of touch, sensory perception of touch, tactual discrimination, tactual perception, Sense, Tactile, Senses, Tactile, Taction, Tactile Senses, Tactile Sense, Sense of Touch, Touch Sense, Tactions, Touch Senses, sense of touch, tactile sensation, touch sense, sensation touch, senses touch, sensation touching, touch sensation, sensation tactile, sense touch, Tactile sensation, Tactile sense, Sense of touch, Touch sensation, function (observable entity), Touch sensation, function, Touch sensation (function), Tactual Discrimination, Tactual Perception
Swedish Beröring
Czech hmat
Finnish Kosketus
Japanese 触覚, タッチ
Spanish Senso Táctil, sensación táctil, tacto (entidad observable), tocar, sentido táctil, tacto, sensación de tacto, función (entidad observable), sensación de tacto, función, tacto (función), Tacto
Portuguese Senso Tátil, Sentido do Tato, Tato
Polish Zmysł dotyku, Dotyk
Norwegian Berøring
French Toucher
German Berührung
Italian Tatto
Dutch Tast

Ontology: Sensory level (C1262068)

Concepts Diagnostic Procedure (T060)
Italian Livello sensoriale
Japanese 感覚レベル, カンカクレベル
Czech Úroveň smyslového vnímání
English sensory level, Sensory level
Hungarian Szenzoros szint
Portuguese Nível sensorial
Spanish Nivel sensorial
Dutch gevoelsniveau
French Niveau sensoriel
German Sensibilitaet

Ontology: sensory exam (C2229507)

Concepts Health Care Activity (T058)
English sensation, sensory exam

Ontology: Dermatome segment of skin (C2335268)

Concepts Body Location or Region (T029)
English Dermatome segment of skin