Muscles of the Back Flashcards
What are the two groups which muscles of the back can be divided into?
Deep or intrinsic
Superficial or extrinsic
Which rami innervates the extrinsic back muscles?
Ventral rami of spinal nerves and accessory nerve
What can the extrinsic muscles be divided into?
Superficial
Intermediate
Which muscles make up the intermediate extrinsic back muscles?
Serratus posterior superior
Serratus posterior inferior
What is the general function of the intermediate group of muscles?
Act as weak accessory muscles for respiration
What rami innervate the intrinsic back muscles?
Posterior rami of spinal nerves
What groups can the intrinsic back muscles be subdivided into?
Superficial
Intermediate
Deep
Which muscles belong to the superficial group of intrinsic back muscles?
Splenius capitis
Splenius cervicis
Where are the splenius muscles located?
The posterolateral surfaces of the neck
Which muscles contribute to the intermediate group of intrinsic muscles of the back?
The large erector spinae muscles:
Spinalis
Longissimus
Iliocostalis
Medial to lateral
Which muscles contribute to the deep group of intrinsic back muscles?
Semispinalis
Multifidis
Rotares
What is the general origin and attachment of the deep intrinsic back muscles?
Origin: Transverse processes of the vertebrae
Attachment: Spinous processes of the superior vertebrae
