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C8 and T1 innervation of forearm muscles.
[thoracic outlet syndrome]
C
8
-
dominant
innervation
of
ulnar
-innervated
and
T
1
-
dominant
innervation
of
median-innervated
intrinsic
hand
muscles
have
been
suggested
,
although
less
is
known
regarding
forearm
muscles
.
We
aimed
to
determine
myotomal
innervation
of
the
forearm
muscles
based
on
the
clinical
and
electromyographial
findings
of
patients
with
C
8
or
T
1
lesions
.
Medical
Research
Council
scale
and
EMG
findings
were
retrospectively
reviewed
in
16
patients
with
C
8
lesions
(
2
postmedian
sternotomy
C
8
plexopathy
and
14
C
8
radiculopathy
)
and
9
patients
with
T
1
-
dominant
lesions
(
8
true
neurogenic
thoracic
outlet
syndrome
and
1
T
1
radiculopathy
)
.
Clinical
and
EMG
findings
revealed
T
1
-
dominant
innervation
of
the
flexor
digitorum
superficialis
,
flexor
digitorum
profundus
of
the
index
finger
,
abductor
pollicis
brevis
,
and
flexor
pollicis
longus
muscles
,
and
C
8
-
dominant
innervation
of
the
flexor
carpi
ulnaris
,
flexor
digitorum
profundus
of
the
little
finger
,
and
digit
extensors
innervated
by
the
posterior
interosseous
nerve
.
The
first
dorsal
interosseous
,
and
abductor
digiti
minimi
muscles
seem
to
be
innervated
by
both
C
8
and
T
1
roots
.
C
8
-
dominant
innervation
of
ulnar
-innervated
muscles
and
T
1
-
dominant
innervation
of
median-innervated
muscles
are
also
evident
for
forearm
flexor
muscles
.
Such
an
additional
evidence
for
myotomal
innervation
will
improve
localization
in
clinical
as
well
as
electrophysiological
diagnoses
.
