6 Questions
originated at anterior vertebrae
NECK FLEXORS
4 TYPES OF TRUNK MUSCLES
- VERTEBRAL COLUMN 2. THORAX 3. ABDOMINAL WALL 4. PELVIC DIAPHRAGM AND PERINEUM
THORACIC MUSCLES
involved almost entirely in breathing ✓ EXTERNAL INTERCOSTALS - elevator ribs during respiration ✓ INTERNAL INTERCOSTALS - depressed the ribs during forced expiration ✓ DIAPHRAGM - "dome-shaped" - major movement into rocks during quiet breathing - contracts - flattened
STERNOCLEIDOMASTOID
prime mover of lateral muscle - seen on anterior and lateral sides
NECK FLEXORS
originated at anterior vertebrae
NECK EXTENSORS
originated at posterior vertebrae
Study Notes
Neck Muscles
- Neck flexors originate at anterior vertebrae
- Neck extensors originate at posterior vertebrae
- Sternocleidomastoid is the prime mover of lateral muscle, visible on anterior and lateral sides
Trunk Muscles
Vertebral Column Muscles
- Erector spinae muscles are responsible for keeping the body straight and erect
- Deep back muscles are located between spinous and transverse processes, responsible for several movements of the vertebral column (extension, flexion, and rotation)
Thoracic Muscles
- External intercostals are elevator muscles that elevate ribs during respiration
- Internal intercostals are depressor muscles that depress ribs during forced expiration
- Diaphragm is a dome-shaped muscle that contracts and flattens during quiet breathing
Abdominal Wall Muscles
- Linea alba consists of white connective tissue rather than muscle
- Rectus abdominis muscle is located on each side of the linea alba
Test your knowledge of deep neck muscles and trunk muscles with this quiz. Identify the neck flexors, extensors, sternocleidomastoid, and trunk muscles including the vertebral column, thorax, abdominal wall, and pelvic diaphragm.
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