scalene muscles
the trapesious muscle
Erector Spinae are extensor muscles encompasing the neck and trunk. Extensor movement is antagonistic to flexor movement. Therefore, find a muscle of the neck and a muscle of the trunk that act as flexors. That should answer your question without giving away all of the milk and honey!
The erector spinae is a group of muscles located along the spine that primarily functions to extend and laterally flex the vertebral column. When activated, these muscles help maintain an upright posture and support movements such as bending backward or side to side. They also play a crucial role in stabilizing the spine during various activities, including lifting and twisting. Overall, the erector spinae is essential for spinal mobility and stability.
The splenius muscles, which include the splenius capitis and splenius cervicis, have distinct insertions. The splenius capitis inserts on the mastoid process of the temporal bone and the lateral third of the superior nuchal line of the occipital bone. The splenius cervicis inserts on the transverse processes of the upper cervical vertebrae, specifically C1 to C3 or C4. These muscles primarily function to extend, rotate, and laterally flex the neck.
The large thick muscle located on either side of the lumbar vertebrae is called the erector spinae. Its main function is to extend and laterally flex the spine.
to make it tight
Your hamstring muscles.
You can flex skeletal muscles voluntary. These are the muscles you can control and move consciously. Smooth muscles and cardiac muscles, which work involuntarily, cannot be consciously flexed.
Hamstring
The sternocleidomastoid muscles are the ones that flex when the intercostals are flexed. This will also cause the scalene muscles to flex.
To flex your chest, you tighten the muscles that are in that area. This might include your arms or back as well, but you tighten the muscles in your chest and abs.
Abdominal muscles are trunk muscles that help to rotate and flex the spine. The abdominal muscles are composed of:Rectus abdominus: originates at the pelvis and inserts into the sternum as well as ribs 5-7. This muscle flexes the spine or assists in posteriorly (behind or in back of) tilting the pelvis.External obliques: one of the abdominal muscles responsible for rotation and flexion (position that is flexed relative to neutral or extension) of the spine. Developing external oblique strength is important for spinal stabilization against movement faults.Internal obliques: one of the abdominal muscles responsible for rotation and flexion of the spine. Developing internal oblique strength is important for spinal stabilization against movement faults.Transversus abdominus: an important spinal-stabilizing muscle