Maximus Gage
The spine is a complex structure of vertebrae, ligaments, and muscles that provides the body with flexibility and a wide range of motion. The back muscles are divided into three groups: superficial, intermediate, and intrinsic (deep) back muscles. These muscles work together to support the spine and allow for movements such as flexion, extension, rotation, and lateral bending. Flexor muscles, attached to the front of the spine, include the abdominal muscles and enable us to flex, bend forward, lift, and arch the lower back. Tight muscles in the back of the thighs can also impact spine movement by affecting the position of the pelvis. Understanding the anatomy of the back muscles is crucial for diagnosing and treating back pain, which is a common issue often related to muscle strain.
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What You'll Learn
- Flexor muscles, attached to the front of the spine, include abdominal muscles
- Extensor muscles, attached to the back of the spine, include the erector spinae
- Oblique muscles are attached to the sides of the spine and help with rotation
- Superficial muscles are the ones closest to the surface and help with shoulder movement
- Deep muscles are the deepest layer, closest to the spine, and are involved in spinal movement
Flexor muscles, attached to the front of the spine, include abdominal muscles
The flexor muscles are attached to the front of the spine and include the abdominal muscles. These muscles enable us to bend forward, flex, lift, and arch the lower back. When the abdominal muscles are weak, the muscles that allow us to bend at the hip get tighter, increasing the curve at the back.
The abdominal muscles work in harmony with other muscles. They control the movement of the spine, pelvis, and rib cage. The abdominal muscles also work with the external obliques to control thoracic extension and rotation created by the extension of the shoulder. Abdominal muscles are also involved in physical activities like biking, running, walking, swimming, and even playing chess.
The deep abdominal muscles, together with the intrinsic back muscles, make up the core muscles. They help keep the body stable and balanced and protect the spine. The transversus abdominis is the deepest muscle layer, and its main roles are to stabilise the trunk and maintain internal abdominal pressure. The rectus abdominis is slung between the ribs and the pubis at the front of the pelvis. When contracting, this muscle has the characteristic bumps or bulges that are commonly called a "six-pack".
The abdominal muscles can be targeted through exercises such as the abdominal draw-in, curl-up, bridging, partial sit-up, hip flexor stretch and squat, and plank and pilates exercises. These exercises can improve abdominal muscle strength and flexibility.
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Extensor muscles, attached to the back of the spine, include the erector spinae
The erector spinae is made up of three muscles: iliocostalis, longissimus, and spinalis. These muscles work together with the glutes (gluteus maximus, gluteus medius, and gluteus minimus) to maintain a stable posture while standing or sitting. The function of the erector spinae is to straighten and rotate the back, as well as to extend and laterally flex the spine.
The iliocostalis muscle is the most lateral of the erector spinae muscles. It is regionally divided into three groups, from superior to inferior: iliocostalis colli, iliocostalis thoracis, and iliocostalis cervicis. The iliocostalis originates from the sacrum, erector spinae aponeurosis, and iliac crest. It has different insertions depending on the specific part of the muscle.
The longissimus muscle is the central and thickest erector spinae muscle. It is also divided into three regional groups, from superior to inferior: longissimus capitis, longissimus colli, and longissimus thoracis. The longissimus muscles have the same innervation as the spinalis muscles and receive arterial blood from branches of the vertebral, deep cervical, occipital, transverse cervical, intercostal, and sacral arteries. The function of the longissimus muscles is to extend and laterally flex the spine, as well as to rotate the head.
The spinalis muscles are the most medial erector spinae muscles. They are also divided into three regional groups, from superior to inferior: spinalis capitis, spinalis colli, and spinalis thoracis. The spinalis muscles receive their blood supply from the vertebral, deep cervical, occipital, intercostal, and lumbar arteries. The function of these muscles is to extend and laterally flex the cervical and thoracic regions of the spine.
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Oblique muscles are attached to the sides of the spine and help with rotation
The oblique muscles are attached to the sides of the spine and help with rotation and maintaining proper posture. They are a group of muscles that run obliquely and medially from the transverse process of the vertebra below to the spinous process, filling the groove on either side of the spinous process. The oblique muscles include the abdominal external oblique muscle, which is the largest and outermost of the three flat abdominal muscles of the lateral anterior abdomen. It is situated on the lateral and anterior parts of the abdomen and is broad, thin, and irregularly quadrilateral, with its muscular portion occupying the side. The external oblique functions to pull the chest downwards and compress the abdominal cavity, increasing intra-abdominal pressure. It also performs ipsilateral (same-side) side-bending and contralateral (opposite-side) rotation: the right external oblique would side-bend to the right and rotate to the left, and vice versa. The internal oblique muscle functions similarly, except it rotates ipsilaterally.
The oblique muscles are just one group of many muscles that surround and support the spine. These muscles work together to support the trunk and hold the body upright, as well as allowing the trunk to move, twist, and bend in multiple directions. The deep muscles of the back, for example, are well-developed and collectively extend from the sacrum to the base of the skull. They are associated with the movements of the vertebral column and the control of posture. The superficial back muscles, on the other hand, are located posteriorly on the back and function to move the scapula. These muscles assist with elevating and depressing the ribs and are also thought to play a role in respiration.
The core muscles, which include the pelvic floor, abdominal wall, back muscles, and diaphragm muscles, stabilise and control the pressure inside the trunk. Strengthening these core muscles through exercises can help reinforce support for the spine and reduce low back pain. This is especially important as, without specific exercise, back and abdominal muscles tend to weaken with age.
Overall, the oblique muscles play a crucial role in spinal rotation and posture maintenance, working in conjunction with other muscle groups to support and facilitate the movements of the spine and back.
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Superficial muscles are the ones closest to the surface and help with shoulder movement
The spine is supported by a large, complex group of muscles that work together to hold the body upright and allow it to move, twist and bend in multiple directions. These muscles are categorised as flexor, extensor, and oblique muscles. Flexor muscles are attached to the front of the spine and include the abdominal muscles, which allow us to flex, bend forward, lift and arch the lower back. Extensor muscles, on the other hand, are attached to the back of the spine and include the large muscles in the lower back, such as the erector spinae, which help hold up the spine and enable us to stand and lift objects. Oblique muscles are attached to the sides of the spine and help with rotating the spine and maintaining proper posture.
Superficial muscles are those that are located closest to the surface of the body. In the context of the spine and back, superficial back muscles are located posteriorly on the back and function to move the scapula. These muscles are fairly large and easily identifiable by palpation. They run from the vertebral column to the rib cage and assist with elevating and depressing the ribs. Superficial back muscles also play a role in respiration.
While this response focuses on superficial muscles near the spine, it is worth noting that the shoulder muscles, which are also superficial, play a critical role in shoulder movement and stability. The shoulder joint, or glenohumeral joint, is a ball-and-socket joint with the most extensive range of motion in the human body. The shoulder muscles provide stability to this highly flexible joint and enable a wide range of movements, including abduction, adduction, flexion, extension, and internal and external rotation.
The primary muscle group supporting the shoulder joint is the rotator cuff muscles, which consist of four muscles: supraspinatus, infraspinatus, teres minor, and subscapularis. These muscles form a cuff around the glenohumeral joint and produce a large spectrum of arm movements. Other important superficial muscles involved in shoulder movement include the deltoid, pectoralis major, and pectoralis minor. The deltoid muscle, located on the outside of the shoulder, helps move the arm forward, backward, and to the side. The pectoralis major and minor muscles attach the upper extremity to the clavicle and thoracic cage, with the pectoralis major also enabling adduction and internal rotation of the arm.
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Deep muscles are the deepest layer, closest to the spine, and are involved in spinal movement
The human back comprises numerous muscles, ligaments, and tendons that support the spine, providing it with flexibility and a wide range of motion. The vertebral column (spine) is formed by 33 vertebrae and their intervening joints, with four curvatures: cervical lordosis, thoracic kyphosis, lumbar lordosis, and sacral kyphosis.
The back muscles can be divided into three groups or layers: superficial (extrinsic), intermediate, and intrinsic (deep) back muscles. The deep muscles are the intrinsic back muscles, forming the deepest layer, closest to the spine. They are well-developed, extending from the sacrum to the base of the skull. These muscles are associated with the vertebral column's movements and the control of posture.
The deep muscles include the transversospinalis muscle group, which lies deep to the erector spinae. The transversospinalis muscles assist in bending the back posteriorly when contracted bilaterally. When unilateral contraction occurs, they facilitate lateral bending and rotation. The nervous supply to these deep muscles arises from the dorsal rami of the spinal nerves, providing sensation to the skin of the back.
Core muscles, which include the pelvic floor, abdominal wall, back muscles, and diaphragm muscles, play a crucial role in stabilising and controlling the pressure inside the trunk. Strengthening these deep trunk muscles through core strength training can effectively alleviate chronic low back pain.
Understanding the anatomy of back muscles is essential for correct diagnosis and treatment, especially when addressing generalized back pain, which is often attributed to skeletal muscle strain.
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Frequently asked questions
The muscles that allow the spine to flex are called flexor muscles. These muscles are attached to the front of the spine and include abdominal muscles.
Back muscles can be divided into three groups: superficial (extrinsic) back muscles, intermediate back muscles, and intrinsic (deep) back muscles.
Superficial back muscles help with shoulder movement and respiration. Intermediate back muscles help with rib movement and respiration. Intrinsic back muscles are the deepest layer of back muscles and are responsible for controlling posture and movements of the vertebral column.
Some examples of back muscles include the latissimus dorsi (commonly known as lats), rhomboids, serratus anterior, serratus posterior superior, serratus posterior inferior, and trapezius (commonly known as traps).
