Lecture 8 Flashcards
What is the primer mover of the back extension
Erector Spinae
How do the muscles and tendons run in the Eretor spinae
Run more/less vertically
What 3 columns does the erector spinae consist of?
- Illicostalis
-Longissimus
-Spinalis
Name the muscles of the Illiocostalis
iliocostalis cervicis
iliocostalis thoracis iliocostalis lumborum
Name the muscles of the longisimus CCT
longisimus capitis
longisimus cervicis
longisimus thoracis
Name the muscles of the Spinalis
spinalis capitis
spinalis cervicis
spinalis thoracis
How many muscles in the Erector spinae?
9
ILIOCOSTALIS
Most lateral muscle group of erector spinae muscles, extending from pelvis to neck.
liocostalis cervicis:
ORIGIN
Angles of 3-6 ribs
liocostalis cervicis
INSERTATION
TVP C4- C6
liocostalis cervicis:
ACTION
Extension, lateral flexion of vertebral column
liocostalis cervicis:
Bilateral action
extension of vertebral column
maintenance of erect posture
stabilization of vertebral column during flexion
liocostalis cervicis:
unilateral action
lateral bend to same side
rotation to same side
liocostalis:
Nerve Supply
Dorsal Primary Rami for all
Iliocostalis thoracic
ACTION
Extension, lateral flexion of vertebral column
Iliocostalis thoracic
ORIGIN
Angles of lower 6 ribs (6-12), medial to iliocostalis lumborum
Iliocostalis thoracic
INSERTATION
lower border of angles of ribs 1-6 & TVP C7
Iliocostalis lumborum:
ACTION
Extension, lateral flexion of vertebral column,
rotates ribs for forceful inspiration
Iliocostalis lumborum
ORIGIN
Medial and lateral sacral crests and medial part of iliac crests
Iliocostalis lumborum
INSERTATION
Angles of lower 6 ribs
LONGISSIMUS CAPITUS
Insertation
Posterior part of the mastoid process of temporal bone
Longissimus
Longissimus
Muscle lateral to the semispinalis
It is the subdivision of the Iliocostalis & extends forward into
the TVPs of the cervical vertebrae
Longissimus Muscles (3)
longissimus capitis
longissimus cervicis longissimus thoracis
Is the Semispinalis capitus apart of the erector spinae?
NO
SPINALIS
Bundle of muscles and tendons located nearest to the spine
Spinalis Capitis
ORIGIN
SP of lower cervical and upper thoracic vertebrae
Spinalis Capitis
INSERTATION
Between superior and inferior nuchal lines of occipital bone
Spinalis Capitis
ACTION
extension and rotates head
Spinalis
NERVE SUPPLY
Dorsal primary rami
Spinalis Cervicis
ORIGIN
Ligamentum nuchae
SP C7
Spinalis Capitis
INSERTATION
SP of axis
Spinalis Capitis
ACTION
Extends Vertebral column
Spinalis thoracis
ORIGIN
SP of T11-12
SP L1-L2
Spinalis Capitis
INSERTATION
SP T1-T8
Spinalis Capitis
ACTION
Extends VC
Spinalis Thoracis
Origin
SP T11-T12
SP L1-L2
Spinalis Thoracis
INSERTATION
SP T1-T8
Spinalis Thoracis
ACTION
Extends VC
Name the muscles in the
Transversospinal group
- SemiSpinalis (3)
-Multifidius
-Rotares
What is the combined action of the transversospinal group?
rotation and extension of the VC
What are the muscles of the Semispinalis?
Semispinalis capitis
Semispinalis cervicis
Semispinalis thoracis
How does the Semispinalis span?
– spanning 4-6 vertebral column
How does the multifidus span?
– spanning 4-6 vertebral column
Where is the semispinalis found
Underneath the erector spinae
Multifidius
Very thin muscle, consists of a number of fleshy and tendinous fasciculi
Fill up the groove on either side of the SP of the vertebrae (from the sacrum to the axis
Multifidius
ORIGIN
Sacral region
along sacral foramina up to PSIS
Multifidius
ORIGIN
Lumbar region –
mammillary processes of vertebrae
Multifidius
ORIGIN
Thoracic region –
TVP
Cervical region – articular processes C4-C7