Deep Back Muscles Flashcards
Axial Musculatures are derived from _____ and are arranged ______.
- Somites
- Into segments (Metamerically)
The 3 groups of the back muscles.
Which ones are extrinsic or intrinsic?
- Superficial (Extrinsic)
- Intermediate (Extrinsic)
- Deep (Intrinsic)
Characteristics of the Superficial back muscles
- Connect Limb to Axial skeleton
- Innervated by Ventral Rami or CN 9 (accessory Nerve)
What are the Sup Back muscles?
5 total
- Trapezius
- Lat Dorsi
- Levator Scapulae
- Rhomboid Major and Minor
Characteristics of the Intermediate Muscles
- RESPIRATORY Muscles
- Innervated by the ventral rami
What are the Intermediate Back muscles?
- Serratus POST Sup
- Serratus POST Inf
Characteristics of the Deep back muscles
- True intrinsic
- Innervated by DORSAL rami
- Divided into 3 groups
1. Sup
2. Int
3. Deep
Muscles of the Deep Superficial Back Muscles
Splenius Capitis and Cervicis
DS = “SC squared”
Muscles of the Deep Int Back Muscles
3 total
- Iliocostalis
- Longissimus
- Spinalis
“I love Sushi”
Muscles of the Deep Deep Back Muscles
3 total
- Semispinalis
- Multifidus
- Rotatores
“Shake my rear”
Deep intermediate muscles are also known as what?
Epaxial muscles
Or
Erector Spinae
Or
Sacrospinalis
Epaxial muscles are reduced in what animal?
Turtles
Deep Deep Back muscles are also know as what?
Transversospinalis
Thoracolumbar Fascia
- Triangular shaped sheet of tough CT covering Lower back
- Partial site of origin of Lat Dorsi and Ab oblique
Action of the Serratus Posterior SUP
To ELEVATE the UPPER ribs during Inspiration
Actions of the Serratus Posterior INF
To pull LOWER ribs INF and Counteracts the DIAPHRAGM
Deep Sup muscles are also known as what?
Spinotransversalis
Deep Deep muscles are also known as what?
Transversospinalis
Origin and Insertion of the Silenus Capitis
Think “Cap” over Cervicis
O: Spinous process of C7 and T1-4
I: Sup unchallenged line & Mastoid
Origin and Insertion of the Silenus Cervicis
O: Spinous process of T3-6
I: C1-C4 transverse processes w/ Levator Scapulae
Characteristics of Superficial (Spinotransversalis) Intrinsic muscles.
- Long muscles
- The ONLY large muscles that arise from the Midline and attach to the Transverse process and SKULL
Characteristics of Intermediate (Sacrospinalis) Intrinsic muscles.
- Run Longitudinally UPWARD
- Transverse process to rib
- Rib to rib
- Rib to Cervical Tran Process
- Spinous process to spinous process
Characteristics of Deep (Transversospinalis) Intrinsic muscles.
- From TP to TP
- CONCEALED by the Erector Spinae
- Muscle arise LATERALLY and Insert MEDIALLY
What vertebra lacks a spinous process?
C1
The Long Rotatores muscle span ___ and the Short Rotatores muscle span ___.
- 2 segments
- 1 segment
