Thorax Flashcards
What muscles are in the superficial layer back muscles? Also called spinotransverse group. (Posterior)
Splenius capitis and splenius cervicis
Splenius = Latin for bandage
Identify muscle, innervation, blood supply, and action
Muscle: Splenius capitis
Innervation: dorsal rami of cervical spinal nerves
Blood supply: N/A
Action: extends, rotates, laterally flexes head and neck
Identify muscle, innervation, blood supply, and action
Muscle: splenius cervicis
Innervation: dorsal rami of cervical spinal nerves
Blood supply: N/A
Action: extends, rotates, laterally flexes head and neck
What muscles are in the erector spinae / sacrospinalis group and where are they located? (Posterior)
Iliocostalis (lateral column)
Longissimus (intermediate column)
Spinalis (medial column)
Intermediate layer of deep back
Identify muscle, innervation, blood supply, and action
Muscle: erector spinae group. From lateral to medial: iliocostalis, longissimus, spinalis
Innervation: dorsal rami of spinal nerves
Blood supply:
Action: extend, rotate, laterally flex vertebral column and head
What muscles are in the transversospinalis deep layer) group and where are they located? (Posterior)
Semispinalis, multifudus, rotatores
VERY DEEP
Identify muscle, innervation, blood supply, and action
Muscle: transversospinalis group. From superficial to deep: semispinalis, mulitifidus, rotatores
Innervation: dorsal rami of spinal nerves
Blood supply: N/A
Action: extends and rotates head, neck, and trunk
What are the pectoral region and axilla muscles? These will be on practical. (Anterior)
Pectoralis major, Pectoralis minor, subclavius, serratus anterior
Identify muscle, innervation, blood supply, and action
Muscle: pec major (superficial to minor)
Innervation: medial and lateral pectoral nerves
Blood supply: thoracoacromial trunk
Action: N/A
Identify muscle, innervation, blood supply, and action
Muscle: pec minor (deep to major)
Innervation: medial and lateral pectoral nerves
Blood supply: thoracoacrominal trunk
Action: N/A
Identify muscle, innervation, blood supply, and action
Muscle: subclavius
Innervation: nerve to subclavius
Blood supply: thoracoacrominal trunk
Action: N/A
Identify muscle, innervation, blood supply, and action
Muscle: serratus anterior (serratus = saw in Latin. Muscle looks like it was sawed in parts)
Innervation: long thoracic nerve
Blood supply: thoracodorsal artery
Action: N/A
Identify muscle, innervation, blood supply, and action
Muscle: external intercostal muscle
Innervation: intercostal nerves
Blood supply: intercostal arteries
Action: elevate ribs in inspiration
Identify muscle, innervation, blood supply, and action
Muscle: internal intercostal muscles
Innervation: intercostal nerves
Blood supply: intercostal arteries
Action: elevates and depresses ribs
Identify muscle, innervation, blood supply, and action
Muscle: innermost intercostal muscles
Innervation: intercostal nerves
Blood supply: intercostal arteries
Action: elevates ribs
Identify muscle, innervation, blood supply, and action
Muscle: transversus thoracis (goes across thorax and connects to costal cartilage)
Innervation: intercostal nerves
Blood supply: intercostal arteries
Action: depresses ribs
Identify muscle, innervation, blood supply, and action
Muscle: subcostalis
Innervation: intercostal nerves
Blood supply: intercostal arteries
Action:elevates ribs
What are the thoracic wall muscles?
External intercostals, internal intercostals, innermost intercostals, transverse thoracis, subcostalis
“Costa” rib in Latin. Intercostals run along the ribs
