ACB 221 Lecture Notes - Brachial Artery, Biceps, Lateral Cord

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Published on 12 Oct 2012
School
U of S
Department
Anatomy and Cell Biology
Course
ACB 221
Professor
Page:
of 2
Nerves of the Arm
Hints:
The radial nerve will be on the back (i.e., posterior) of the arm – hence it comes
off of the posterior cord.
oThis is also a clue as to the fact that the radial nerve will branch off into
the dorsal digital nerves (dorsal being on the posterior (back) of the
hand).
Find the “M” first. The lateral cord will go deep, under the biceps brachii and
follow down along the arm. The lateral cord will follow along the lateral side of
the humerus to the ulna – it can be found between the olecranon and the lateral
condyle of the humerus (i.e., your funny bone which isn’t a bone at all, it is a
nerve ). The middle part of the “M” will form into the median nerve, which will
follow along the upper arm and lower arm (i.e., forearm) on the anterior side
Legend:
Superficial
Deep
Nerves of the Arm
hence it will branch off into the palmar nerves (i.e., your palms being on your
anterior or front side of the body in anatomical position).
Be aware : The “M” will not always be neat! Sometimes the middle dip of the
“M” will be neat (as the picture on the left) and other times it will be messy (as
the picture on the right). Just to make you aware that although the picture I
drew and the picture in your textbook are nice and neat, there is always
individual variations.
Neat
Messy
How can you tell the difference between an artery and a nerve?
oWhen you feel an artery, you should notice that it is hollow in the
middle part of the artery and thick on the outer portions. What you are
feeling is the hollow space where the blood moves through and on the
sides, you will feel the thick muscular walls of the artery.
oWhen you feel a nerve, you will notice that it is homogenous. That is,
you should notice that there is no inner hollow area instead it feels
the same throughout.
“Veins, Arteries, and Nerves travel together in a V.A.N.” So, if you are having
trouble finding the posterior cord, try to first find the large brachial artery in the
upper arm. Once you find this, the posterior cord will be nearby.
NOTE: If you did not see this, please ask either me or Chad and we will be happy
to show you this.

Document Summary

The lateral cord will go deep, under the biceps brachii and follow down along the arm. The middle part of the m will form into the median nerve, which will follow along the upper arm and lower arm (i. e. , forearm) on the anterior side . Nerves of the arm: be aware hence it will branch off into the palmar nerves (i. e. , your palms being on your anterior or front side of the body in anatomical position). : the m will not always be neat! M will be neat (as the picture on the left) and other times it will be messy (as the picture on the right). Just to make you aware that although the picture i drew and the picture in your textbook are nice and neat, there is always individual variations. Note: if you did not see this, please ask either me or chad and we will be happy to show you this.