DOI Page / Citation link:
https://doi.org/10.11588/diglit.6271#0219
< 193 )
coming from the first pair of dorsal nerves, and another from
the great intercostal. From the neck it passes between the
clavicle and subclavian artery into the thorax, and descends
along the pericardium to the upper surface of the diaphragm,
where it divides into numberless branches, which are. lost in
its substance. The right phrenic runs opposile to the supe-
rior cava and right auricle ; while the left curves over the pe-
ricardium, at the apex of the heart.
NERVES OF THE UPPER EXTREMITIES.
All the nerves of the upper extremities arise from the bra-
chial plexus, situated in the neck, which is chiefly constituted
by the union of the five lowermost cervical nerves, and a
large branch of the first pair of the back. Several small
branches are first given off to contiguous parts, and then—
1. The axillary nerve, which sometimes arises from the
radial nerve. It runs backwards and outwards around the
neck of tire humerus, and ramifies in the muscles of the
scapula.
2. The external cl'TAneal, which perforates the coraco-
brachial muscle, to the bend of the. arm, where it accom-
panies the median vein as far as the thumb, and is lost in its
integuments.
3. The intern al cutAneal, which descends on the inside
of the arm, where it bifurcates. From the bend of the arm,
the anterior branch accompanies the basilic vein, to be in-
serted into the skin of the palm of the hand; the posterior
branch runs down the internal part of the foie arm, to vanish
in the skin of the little finger.
4. The median nerve, which accompanies the brachial
artery to the cubit, then passes between the brachials inter-
nals, pronator rotindus, and the perforators, and perforans, un-
it
coming from the first pair of dorsal nerves, and another from
the great intercostal. From the neck it passes between the
clavicle and subclavian artery into the thorax, and descends
along the pericardium to the upper surface of the diaphragm,
where it divides into numberless branches, which are. lost in
its substance. The right phrenic runs opposile to the supe-
rior cava and right auricle ; while the left curves over the pe-
ricardium, at the apex of the heart.
NERVES OF THE UPPER EXTREMITIES.
All the nerves of the upper extremities arise from the bra-
chial plexus, situated in the neck, which is chiefly constituted
by the union of the five lowermost cervical nerves, and a
large branch of the first pair of the back. Several small
branches are first given off to contiguous parts, and then—
1. The axillary nerve, which sometimes arises from the
radial nerve. It runs backwards and outwards around the
neck of tire humerus, and ramifies in the muscles of the
scapula.
2. The external cl'TAneal, which perforates the coraco-
brachial muscle, to the bend of the. arm, where it accom-
panies the median vein as far as the thumb, and is lost in its
integuments.
3. The intern al cutAneal, which descends on the inside
of the arm, where it bifurcates. From the bend of the arm,
the anterior branch accompanies the basilic vein, to be in-
serted into the skin of the palm of the hand; the posterior
branch runs down the internal part of the foie arm, to vanish
in the skin of the little finger.
4. The median nerve, which accompanies the brachial
artery to the cubit, then passes between the brachials inter-
nals, pronator rotindus, and the perforators, and perforans, un-
it