Back Myology Flashcards
Trapezius M. Origin and insertion
Spinous process of C7 to C12, ligamentum Nuchae, External Occipital Protuberance and Medial 1/3 of Superior Nuchal line of Occipital B.
Lateral 1/3 of the clavicle, acromion and scapular spine
Trapezius Action
Whole muscle (Rotate point of the Glenoid Cavity
superiorly, Retract the Scapula), Upper fibers (Elevate Scapula),
Lower fibers (Depress Scapula) With the Scapula fixed the
Upper fibers will Extend the Neck working bilaterally, Laterally
Flex the Neck and Rotate the Face away when working
unilaterally
Trapezius M Innervation
Motor: Spinal Accessory N. CN XI
Sensory: C3, C4
Latisimus Dorsi M. origin and Insertion
Spinous processes of T6-T12, ribs 9-12, iliac crest and Spinous Processes of L1-L5 and median sacral Crest via Thoracolumbar Fascia
Floor of the Humeral Intertubercular Groove
Latissimous Dorsi M. Action
Extend, Adduct and medially rotate the Humerus, rotate the Lenoid Cavity inferiorly
Latissimus Dorsi Innervation
Thoracodorsal Nerve (C6-C8)
Rhomboid Major m Orgin and insertion
Spinous process of T2 to T5
Medial border of the scapula (inferior to scapular spine)
Rhomboid Major m action
Retract and elevate the scapula and rotate the glenoid cavity inferiorly
Rhomboid Major M. Innervation
Dorsal Scapular N (C4,5)
Rhomboid Minor M Orgin and insertion
Spinous process of C7 and T1, lower part of the ligamentum Nuchae
Medial Border of the scapula (at scapular spine)
Rhomboid Minor M. Action
Retract and elevate the scapula and rotate the glenoid cavity inferiorly
Rhomboid Minor M Innervation
Dorsal Scapular N. (C4, C5)
Levator Scapulae M. Orgin and Insertion
Posterior tubercles of the Transverse process C1-C4
Medial border of the scapula (superior to scapular spine)
Levator scapulae M Action
Elevate the scapula and rotate the glenoid cavity inferiorly and when the scapula is fixed Extend and laterally flex the neck
Levator Scapule m. Innervation
Dorsal Scapular N (C3, 4, and 5)
Serratus Posterior Superior M. Orgin and Insertion
Nuchal L, and spinous processes C7-T3
Superior surfaces of the ribs 2-4
Serratus Posterior Superior M Action
Elevate the ribs with forced inspiration (Primarily proprioception)
Serratus Posterior Superior M Innervation
Intercostal N (2-5)
Serratus Posterior Inferior M. orgin and insertion
Spinous processes T11-L2
Inferior Surface of Ribs 8-12
Serratus Posterior Inferior actions
Depress ribs with forced expiration (primarily proprioceptive
Serratus Posterior inferior innervation
Anterior Rami T9-T12
Splenius Capitis M. Origin and Insertion
lower 1/2 Nuchal L. Spinous process C7-T3
Mastoid process of the Temporal B, Lateral 1/3 Superior Nuchal Line of the Occipital B.
Splenius Capitis M Action
Etend the neck when working Bilaterally
laterally flex
the Neck and rotate face toward when working unilateral
Splenius Capitis M Innervation
Posterior Rami C3-C5
Splenius Cervicis M origin and innsertion
Spinous processes T3-T6
Tranversous Processes C1-3(4)
Splenius Cervicis M Action
Extend the neck when working bilaterally and Laterally flex the neck and rotate face toward muscle when working unilaterally
Splenius Cervicis M Innervation
Poster Rami C5-C7
Erector Spinae Group innervation
Segmentally innervated by posterior Rami of the spinal nerves
Erector Spinae Group Actions
Maintain erect posture and extend the Vertebral column and head when working Bilaterally and laterally flex the Vertebral column when working unilaterally
Illiocostalis muscle groups
Illiocostalis Lumborum
Illiocostalis Thoracis
Illiocostalis Cervicis
Travel from Costal Angles of Ribs
Longissimus Muscle Groups
Longissimus Thoracis M
Longissimus Cervicis M
Longissimus Capitis M
Travel via the transverse and Articular processes
Spinialis Muscle groups
Spinialis Thoracis M
Spinialis Cervicis M
Spinialis Capitis M
Travel between Spinous processes
Back Sprain
injury to the ligamentous attachments between bone usually due to inadequate stretching before activity
Back Strain
Excessive stretching and sometimes tearing of muscle fibers produced by an overly strong muscle contraction
Semispinalis muscle group description and innervation
Layer 6 Transversospinalis Group Extends 5 or more spinal segments Semispinalis Thoracis M Semispinalis Cervicis M Semispinalis Capitis M
Innervated by Posterior Rami
Semispinalis Capitis M action
Extend head and rotate the face away
Multifidius M
Extends 3 or 4 spinal segments
O: Mamillary processes of Lumbar Vertebrae, Transverse
Processes of Thoracic Vertebrae and Articular Processes of C4-7
I: Spinous processes three numeric segments superior,
does not insert onto the Atlas
Extend spine and rotate the spine away
Inn: Posterior Rami
Rotatores Longus M.
Extends 2 spinal segments
O: Transverse process
I: Roots of spinous process 2 numeric segments superior
Extend spine and rotate the spine away
Inn: Posterior Rami
Rotatores Brevis M
Extending to adjacent spinal Segment
Transverse process
to roots of spinous process 1 numeric segment away
Primarily proprioceptive
Posterior Rami
Interspinalis M
O: Spinous process
I: Adjacent Spinous process
A: Extend Spine
N: Posterior Rami
Intertransversarii M
O: Transverse process I: Adjacent transverse process A: Laterally Flex spine N: Posterior portion (Posterior Rami), Anterior portion (Anterior Rami)
Levator Costarum Longus M
O: Transverse Processes C7-T11
I: 2nd rib inferior to origin
A: Elevate ribs
N: Posterior Rami
Levator Costarum Brevis M
O: Transverse Processes C7-T11
I: Adjacent rib inferior to origin
A: Elevate ribs
N: Posterior Rami
Rectus Capitis Posterior Major M
Medial border of the suboccipital triangle
O: Spinous Process C2
I: Lateral portion Inferior Nuchal Line
A: Extend Head, Rotate Face toward
N: Suboccipital N
rectus Capitis posterior Minor M
O: Posterior tubercle C1
I: Below Inferior Nuchal Line
A: Extend Head
N: Suboccipital N.
Obliquus Capitis Inferior M
Inferior Border of the Suboccipital Triangle
O: Spinous Process C2
I: Transverse process C1
A: Rotate the Face toward
N: Suboccipital N.
Obliquus Capitis Superior M
Lateral Border of the Suboccipital triangle
O: Transverse process C1
I: Between Superior and Inferior Nuchal Lines
A: Extend and Laterally Flex Head
N: Suboccipital N.
What is in the middle of the Suboccipital triangle
Traveling through the floor of the suboccipital triangle is the Vertebral A and the suboccipital N which is C1 cervical spinal N
