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level: Muscles of the Epaxial region

Questions and Answers List

level questions: Muscles of the Epaxial region

QuestionAnswer
SpleniusOrigin:Inferior Skull, spinous process T1-6 Insertion: Transverse process (c1-c4), mastoid process and occipital bone Action: extend (bilaterally) and laterally flex (unilaterally) head and neck Innervation: Cervical and thoracic Dorsal Rami
IliocostalisOrigin:Iliac crest, posterior sacrum, inferior lumbar, and sacral spinous processes Insertion: Angles of the ribs and transverse process (c4-c6) Action: extend vertebral column (bilaterally), laterally flex vertebral column(unilaterally) Innervation: Cervical and thoracic Dorsal Rami
LongissimusOrigin:Origin:Iliac crest, posterior sacrum, inferior lumbar, and sacral spinous processes Insertion: Transverse processes of cervical and Thoracic, mastoid processes Action: Extend head and neck (bilaterally), laterally flex head/neck (Unilaterally) Innervation: Cervical and thoracic dorsal Rami
SpinalisOrigin:Origin:Iliac crest, posterior sacrum, inferior lumbar, and sacral spinous processes Insertion: Spinous processes of cervical and thoracic Action: Extend vertebral column (bilaterally), Laterally flex vertebral column (unilaterally) Innervation: Cervical and thoracic dorsal Rami
SemispinalisOrigin: Transverse Processes of Cervical and Thoracic Insertion: Spinous Processes of vertebrae 6-7 (superior to origin), Back of skull Action: Extend head and neck (bilaterally), Laterally flex head and neck (Unilaterally) Innervation: Cervical and thoracic dorsal Rami
MultifidusOrigin: Transverse processes of (C2) through Sacral vertebrae Insertion: Spinous Processes 2-3 segments superior to origin Action: Extend Vertebral Column (bilaterally), laterally flex vertebral column (unilaterally) Innervation: Dorsal Rami of the Spinal Nerves