Spinalis origin and insertion

The spinalis muscle is the most medial of the erector spinae group of muscles, and is lateral to the multifidus group.

The spinalis muscle is situated in the middle and upper back as well as the neck, running parallel to the spine. It plays an important role in extending the back and neck, while also aiding in lateral flexion movements. The spinalis muscle is a member of the erector spinae muscle group. The erector spinae muscles consist of the spinalis, iliocostalis , and the longissimus. The erector spinae muscles are deep muscles of the back which run in a vertical direction, parallel to the vertebral column.

Spinalis origin and insertion

The spinalis is a portion of the erector spinae , a bundle of muscles and tendons , located nearest to the spine. It is divided into three parts: Spinalis dorsi, spinalis cervicis, and spinalis capitis. Spinalis dorsi, the medial continuation of the sacrospinalis , is scarcely separable as a distinct muscle. It is situated at the medial side of the longissimus dorsi , and is intimately blended with it; it arises by three or four tendons from the spinous processes of the first two lumbar and the last two thoracic vertebrae : these, uniting, form a small muscle which is inserted by separate tendons into the spinous processes of the upper thoracic vertebrae, the number varying from four to eight. It is intimately united with the semispinalis dorsi , situated beneath it. Spinalis cervicis, or spinalis colli, is an inconstant muscle, which arises from the lower part of the nuchal ligament , the spinous process of the seventh cervical, and sometimes from the spinous processes of the first and second thoracic vertebrae , and is inserted into the spinous process of the axis , and occasionally into the spinous processes of the two cervical vertebrae below it. Spinalis capitis biventer cervicis is usually inseparably connected with the semispinalis capitis. Spinalis capitis is not well characterized in modern anatomy textbooks and atlases, and is often omitted from anatomical illustration. However, it can be identified as fibers that extend from the spinous processes of TV1 and CV7 to the cranium, often blending with semispinalis capitis [ citation needed ]. This article incorporates text in the public domain from page of the 20th edition of Gray's Anatomy Contents move to sidebar hide. Article Talk. Read Edit View history. Tools Tools. Download as PDF Printable version.

The erector spinae muscles are deep muscles of the back which run in a vertical direction, parallel to the vertebral column.

The spinalis is a deep muscle of the back. It is the smallest of the muscle columns within the erector spinae complex, and can be divided into the three parts — thoracic, cervicis and capitis although the cervicis part is absent in some individuals. It is the smallest of the muscle columns within the erector spinae complex, and can be divided into the three parts - thoracic, cervicis and capitis although the cervicis part is absent in some individuals. Once you've finished editing, click 'Submit for Review', and your changes will be reviewed by our team before publishing on the site. We use cookies to improve your experience on our site and to show you relevant advertising. To find out more, read our privacy policy. Spinalis Home Encyclopaedia S Spinalis.

Search site Search Search. Go back to previous article. Sign in. Eye Muscle Action Origin Insertion levator palpebrae superioris elevating and retracting the upper eyelid sphenoid bone upper eyelid inferior oblique looking up and laterally eye roll maxilla bone eyeball inferior, lateral inferior rectus looking down depression sphenoid bone eyeball inferior, medial lateral rectus looking laterally abduction sphenoid bone eyeball lateral, anterior medial rectus looking medially adduction sphenoid bone eyeball medial superior oblique looking down and laterally eye roll sphenoid bone eyeball superior, lateral superior rectus looking up elevation sphenoid bone eyeball superior, anterior. Thorax Muscle Action Origin Insertion diaphragm increasing thoracic volume for inhalation sternum, ribs, lumbar vertebrae central tendinous sheet external intercostals elevating ribs inferior aspects of ribs superior aspects of ribs innermost intercostals adducting the ribs, decreasing thoracic volume for exhalation inferior aspects of ribs superior aspects of ribs internal intercostals depressing ribs superior aspects of ribs inferior aspects of ribs pectoralis major flexing, adducting, and medially rotating the arm at the shoulder sternum, clavicle humerus pectoralis minor elevating the ribs, moving scapula anterior and inferior, protracting and elevating the shoulder ribs scapula serratus anterior moving and fixing scapula anteriorly, protracting the shoulder ribs scapula. Abdomen Muscle Action Origin Insertion external oblique flexing vertebral column, rotating vertebral column, compressing the abdomen lower ribs ilium, pubis, linea alba internal oblique flexing vertebral column, rotating vertebral column, compressing the abdomen lumbar vertebrae, ilium pubis, linea alba, lower ribs, sternum rectus abdominis flexing vertebral column, compressing the abdomen pubis lower ribs, sternum transversus abdominis compressing the abdomen lower ribs, ilium, lumbar vertebrae pubis, linea alba. Rotator Cuff Muscle Action Origin Insertion infraspinatus laterally rotating the shoulder scapula humerus subscapularis medially rotating the shoulder, stabilizes shoulder joint scapula humerus supraspinatus abducting the shoulder, stabilizes shoulder joint scapula humerus teres minor laterally rotating the shoulder scapula humerus. Arm Shoulder to Elbow Muscle Action Origin Insertion biceps brachii flexing the arm at the elbow scapula radius brachialis flexing the arm at the elbow humerus ulna coracobrachialis flexing and adducting the arm scapula humerus deltoid abducting the arm at the shoulder, flexing and extending arm at the shoulder clavicle, scapula humerus triceps brachii extending the arm at the elbow humerus, scapula ulna. Attributions "Anatomy and Physiology" by J.

Spinalis origin and insertion

Federal government websites often end in. Before sharing sensitive information, make sure you're on a federal government site. The site is secure. NCBI Bookshelf. The muscles of the back categorize into three groups. The intrinsic or deep muscles are those muscles that fuse with the vertebral column.

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The spinalis thoracis section is involved in trunk extension. It attaches to the spinous processes of C2, T1-T8 and the occipital bone of the skull. It is the smallest of the muscle columns within the erector spinae complex, and can be divided into the three parts - thoracic, cervicis and capitis although the cervicis part is absent in some individuals. Each segment of the erector spinae muscles receives innervation from the posterior ramus of the corresponding spinal nerve. If you do not consent to the use of these technologies, we will consider that you also object to any cookie storage based on legitimate interest. It is situated at the medial side of the longissimus dorsi , and is intimately blended with it; it arises by three or four tendons from the spinous processes of the first two lumbar and the last two thoracic vertebrae : these, uniting, form a small muscle which is inserted by separate tendons into the spinous processes of the upper thoracic vertebrae, the number varying from four to eight. Not yet rated. Muscle Fiber Types Explained. You can consent to the use of these technologies by clicking "accept all cookies". We also use third-party cookies that help us analyze and understand how you use this website. Anatomical terms of muscle [ edit on Wikidata ]. In such instances, the spinalis capitis still originates from the spinous processes of C6 to T2 or the associated ligamentum nuchae, but the fibers blend with those of the semispinalis capitis before inserting onto the occiput. Obturator Internus Muscle Anatomy.

The spinalis Latin: musculus spinalis is one of the muscles forming the erector spinae - a muscle complex consisting of several smaller intrinsic deep back muscle groups that all together form the intermediate layer of the deep back muscles. The other two groups are the longissimus and iliocostalis muscles. The erector spinae muscles run along the length of the spine , and the spinalis is the most medial of the three erector spinae muscles.

It plays an important role in extending the back and neck, while also aiding in lateral flexion movements. Unilateral contraction refers to the contraction of one side, while bilateral contraction refers to the contraction of both sides together [7]. The capitis is the most superior of these sections, the cervicis is in the middle, and the thoracis is the most inferior [2]. Actions: Acts unilaterally to laterally flex the vertebral column. Cookies allow us to analyze and store information such as the characteristics of your device as well as certain personal data e. Therefore, some authors use the compound name "thoracic and cervical spinal and semispinal muscle" to describe this muscular complex. Fibularis Brevis Muscle Anatomy. Unilateral contraction, on the other hand, causes ipsilateral lateral flexion of the neck [9]. PMID: You can freely give, refuse or withdraw your consent at any time by accessing our cookie settings tool. In