Cross-SectionalAnatomy
TypicalThoracicSpinalNerve:CrossSection
Plate177
External intercostal muscle
Internal intercostal muscle
Innermost intercostal muscle
Anterior branch
Posterior branch
Lateral cutaneous branch
Anterior cutaneous branch
Lateral branch
Medial branch
Sternum
Transversus thoracis
muscle
External
intercostal membrane
Intervertebral
foramen
Ventral root
Dorsal root
Spinal nerve
Ventral ramus (intercostal nerve)
Dorsal root (spinal)
ganglion
Sympathetic ganglion
Gray and white rami communicantes
Trapezius muscle
Dorsal ramus
Posterior cutaneous branch
Medial branch
Lateral branch
Rhomboid major muscle
Erector spinae muscle
Internal intercostal membrane
Infraspinatus muscle
Scapula
Teres major muscle
Subscapularis muscle
Latissimus dorsi muscle
Serratus anterior muscle
Note
:
In lower thoracic
region, lateral branch of
dorsal ramus is longer,
motor, and cutaneous;
medial branch is shorter
and motor only.
See±also±
Plate 254
±
