medical

Following is a list of spinal nerves and points that are characteristically belonging to the dermatome of each nerve :

  • C1 : Exception
  • C2 - At least one cm lateral to the occipital protuberance at the base of the skull. Alternately, a point at least 3 cm behind the ear.

  • C3 - In the supraclavicular fossa, at the midclavicular line.

  • C4 - Over the acromioclavicular joint.

  • C5 - On the lateral (radial) side of the antecubital fossa, just proximally to the elbow.

  • C6 - On the dorsal surface of the proximal phalanx of the thumb.

  • C7 - On the dorsal surface of the proximal phalanx of the middle finger.

  • C8 - On the dorsal surface of the proximal phalanx of the little finger.

  • T1 - On the medial (ulnar) side of the antecubital fossa, just proximally to the medial epicondyle of the humerus.

  • T2 - At the apex of the axilla.

  • T3 - Intersection of the midclavicular line and the third intercostal space

  • T4 - Intersection of the midclavicular line and the fourth intercostal space, located at the level of the nipples.

  • T5 - Intersection of the midclavicular line and the fifth intercostal space, horizontally located midway between the level of the nipples and the level of the xiphoid process.

  • T6 - Intersection of the midclavicular line and the horizontal level of the xiphoid process.

  • T7 - Intersection of the midclavicular line and the horizontal level at one quarter the distance between the level of the xiphoid process and the level of the umbilicus.

  • T8 - Intersection of the midclavicular line and the horizontal level at one half the distance between the level of the xiphoid process and the level of the umbilicus.

  • T9 - Intersection of the midclavicular line and the horizontal level at three quarters of the distance between the level of the xiphoid process and the level of the umbilicus.

  • T10 - Intersection of the midclavicular line, at the horizontal level of the umbilicus.

  • T11 - Intersection of the midclavicular line, at the horizontal level midway between the level of the umbilicus and the inguinal ligament.

  • T12 - Intersection of the midclavicular line and the midpoint of the inguinal ligament.

  • L1 - Midway between the key sensory points for T12 and L2.

  • L2 - On the anterior medial thigh, at the midpoint of a line connecting the midpoint of the inguinal ligament and the medial epicondyle of the femur.

  • L3 - At the medial epicondyle of the femur.

  • L4 - Over the medial malleolus.

    S1 - On the lateral aspect of the calcaneus.

  • S2 - At the midpoint of the popliteal fossa.

  • S3 - Over the tuberosity of the ischium or infragluteal fold.

  • S4 and S5 - In the perianal area, less than one cm lateral to the mucocutaneous zone.

Haemoglobin (also spelled haemoglobin and abbreviated Hb or Hgb) is the iron-containing oxygen-transport metalloprotein in the red blood cells of all vertebrates (except the fish family Channichthyidae) and the tissues of some invertebrates. Hemoglobin in the blood is what transports oxygen from the lungs or gills to the rest of the body (i.e. the tissues) where it releases the oxygen for cell use, and collects carbon dioxide to bring it back to the lungs.