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Questions and Answers
What is the location of serratus posterior superior in relation to the rhomboid muscles?
What is the location of serratus posterior superior in relation to the rhomboid muscles?
- Deep to the rhomboid muscles (correct)
- Lateral to the rhomboid muscles
- Medial to the rhomboid muscles
- Superficial to the rhomboid muscles
What is the innervation of the serratus posterior muscles?
What is the innervation of the serratus posterior muscles?
- Segmental branches of the anterior rami of intercostal nerves (correct)
- Segmental branches of the posterior rami of spinal nerves
- Segmental branches of the anterior rami of spinal nerves
- Segmental branches of the posterior rami of intercostal nerves
What is the vascular supply of the serratus posterior muscles?
What is the vascular supply of the serratus posterior muscles?
- Segmental pattern through the spinal arteries
- Segmental pattern through the lumbar arteries
- Segmental pattern through the intercostal arteries (correct)
- Segmental pattern through the thoracic arteries
What is the direction of the transversospinales muscles?
What is the direction of the transversospinales muscles?
Which group of muscles is the most superficial in the transversospinales group?
Which group of muscles is the most superficial in the transversospinales group?
What is the attachment of the semispinalis muscles?
What is the attachment of the semispinalis muscles?
What is the characteristic of the multifidus muscles?
What is the characteristic of the multifidus muscles?
What is the innervation of the deep or intrinsic muscles of the back?
What is the innervation of the deep or intrinsic muscles of the back?
What is the origin of the Splenius capitis muscle?
What is the origin of the Splenius capitis muscle?
Which muscle inserts into the transverse processes of CIV to CVI?
Which muscle inserts into the transverse processes of CIV to CVI?
What is the function of the Splenius capitis and Splenius cervicis muscles together?
What is the function of the Splenius capitis and Splenius cervicis muscles together?
Which muscle has its origin in the sacrum and spinous processes of lumbar and lower two thoracic vertebrae?
Which muscle has its origin in the sacrum and spinous processes of lumbar and lower two thoracic vertebrae?
What is the insertion of the Longissimus capitis muscle?
What is the insertion of the Longissimus capitis muscle?
Which muscle group extends the head at the atlantoaxial joint?
Which muscle group extends the head at the atlantoaxial joint?
What is the innervation of the Splenius capitis muscle?
What is the innervation of the Splenius capitis muscle?
Which muscle has its insertion into the spinous processes of TI to TVIII?
Which muscle has its insertion into the spinous processes of TI to TVIII?
What is the function of the Splenius cervicis muscle individually?
What is the function of the Splenius cervicis muscle individually?
Which muscle group includes the Iliocostalis lumborum, Iliocostalis thoracis, and Iliocostalis cervicis muscles?
Which muscle group includes the Iliocostalis lumborum, Iliocostalis thoracis, and Iliocostalis cervicis muscles?
Which muscle originates from the transverse processes of the upper five or six thoracic vertebrae?
Which muscle originates from the transverse processes of the upper five or six thoracic vertebrae?
What is the insertion point of the Semispinalis thoracis muscle?
What is the insertion point of the Semispinalis thoracis muscle?
Which muscle forms the medial border of the triangle?
Which muscle forms the medial border of the triangle?
What is the origin of the Multi dus muscle?
What is the origin of the Multi dus muscle?
Which muscle inserts into the spinous processes of the cervical vertebrae?
Which muscle inserts into the spinous processes of the cervical vertebrae?
What is the origin of the Rotatores lumborum muscle?
What is the origin of the Rotatores lumborum muscle?
Which muscle inserts into the medial area between the superior and inferior nuchal lines of the occipital bone?
Which muscle inserts into the medial area between the superior and inferior nuchal lines of the occipital bone?
What is the insertion point of the Rotatores cervicis muscle?
What is the insertion point of the Rotatores cervicis muscle?
Study Notes
Back Muscles
- Deep or intrinsic muscles of the back extend from the pelvis to the skull and are innervated by segmental branches of the posterior rami of spinal nerves.
- Muscles in this group include the spinotransversales, erector spinae, transversospinales, and suboccipital muscles.
Spinotransversales Muscles
- Two spinotransversales muscles run from the spinous processes to the transverse processes of the vertebrae.
- Examples of spinotransversales muscles include:
- Splenius capitis: originates from the lower half of the ligamentum nuchae and spinous processes of CVII to TIV, inserts into the mastoid process and skull, and is innervated by posterior rami of middle cervical nerves.
- Splenius cervicis: originates from the spinous processes of TIII to TVI, inserts into the transverse processes of CI to CIII, and is innervated by posterior rami of lower cervical nerves.
Erector Spinae Group of Back Muscles
- Consists of three subgroups: iliocostalis, longissimus, and spinalis.
- Examples of erector spinae muscles include:
- Iliocostalis lumborum: originates from the sacrum, spinous processes of lumbar and lower two thoracic vertebrae, and iliac crest, and inserts into the angles of the lower six or seven ribs.
- Iliocostalis thoracis: originates from the angles of the lower six ribs and inserts into the angles of the upper six ribs and the transverse process of CVII.
- Longissimus thoracis: originates from the transverse processes of lumbar vertebrae and inserts into the transverse processes of all thoracic vertebrae and just lateral to the tubercles of the lower nine or ten ribs.
Transversospinales Group of Back Muscles
- Consists of three subgroups: semispinalis, multifidus, and rotatores.
- Examples of transversospinales muscles include:
- Semispinalis thoracis: originates from the transverse processes of TVI to TX and inserts into the spinous processes of upper four thoracic and lower two cervical vertebrae.
- Multifidus: originates from the sacrum, origin of erector spinae, posterior superior iliac spine, mammillary processes of lumbar vertebrae, transverse processes of thoracic vertebrae, and articular processes of lower four cervical vertebrae, and inserts into the base of spinous processes of all vertebrae from LV to CII (axis).
- Rotatores lumborum: originates from the mammillary processes of lumbar vertebrae and inserts into the spinous processes of lumbar vertebrae.
Suboccipital Muscles
- A small group of deep muscles in the upper cervical region.
- Contraction of the suboccipital muscles extends the head at the atlantoaxial joint.
- Examples of suboccipital muscles include:
- Rectus capitis posterior major: forms the medial border of the triangle and originates from the posterior ramus of C1.
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Description
This quiz covers the anatomy of back muscles, including the serratus posterior muscles and transversospinales muscles. It also covers their innervation and relations with other muscles.
