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Joint: joints of the heads of ribs
Articulation?
aka?
What kind of a joint is it?
- Articulation: head of each rib with the body of at least one thoracic vertebra
- aka: costovertebral joints
- kind: plane synovial joint
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Joint: costotransverse joint
Articulation?
aka?
Kind of joint?
- Articulation: tubercle articulates with the transverse process of a single thoracic vertebra
- aka: costovertebral joint
- kind? plane synovial joint
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Muscle: External intercostal (3 layers)
Direction of fibers?
How many pairs?
origin?
insertion?
innervation?
Action?
- Direction: down towards pockets; anteroinferiorly
- Pairs: 11
- Origin:
- Insertion:
- innervation: 1-11 intercostal nerves
- action: keep the intercostal spaces rigin during breathing; most active during inspiration elevating ribs
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Muscle: Internal intercostal (3 layers) --> similar to innermost intercostal muscle (3 layers)
Direction of fibers?
How many pairs?
origin?
insertion?
innervation?
Action?
- Direction: perpendicular to external fibers; run inferoposteriorly from the floor of the costal grooves to the ribs below
- Pairs: 11
- Origin:
- Insertion:
- innervation: 1-11 intercostal nerves
- action: keep the intercostal spaces rigin during breathing; most active during expiration depressing ribs
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Muscle: Transversus thoracis (ant. chest wall)
origin:
insertion:
innervation:
action:
- origin: inner surface of costal cartilage of 2-6 ribs
- insertion: inner surface of sternum and xiphoid process
- innervation: 2-7 intercostal nerves
- action: lowers ribs(in expiration)
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Muscle: subcostalis
origin:
insertion:
innervation:
action:
- origin: internal surfaceof lower ribs near their angles
- insertion: superior borders of 2 or 3 ribs below
- innervation:
- action: same as internal costal muscles; keep spaces rigid during breathing; most active during expiration depressing ribs
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Arteries of the thoracic wall
The post. intercostal arteries arise from?
The ant. intercostal arteries aris from?
Nerves of the thoracic wall
The intercostal nerves are?
the subcostal nerve arises from?
- Arteries of the thoracic wall
- The post. intercostal arteries arise from the thoracic aorta.
- The ant. intercostal arteries aris from indirect or
- direct branches of the internal thoracic artery.
- Nerves of the thoracic wall
- The intercostal nerves are the ventral rami of the
- T1-T11 nerves
- the subcostal nerve arises from is the ventral ramus of the T12 nerve
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Muscle: diaphragm
Origin:
Insertion:
innervation:
action:
- origin:
- insertion: central tendon
- innervation: phrenic nerve of cervical plexus (C3-C5)
- action: for respiration
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Muscle: rectis abdominis (6 pack muscle)
encase in?
divided by segments called?
origin:
insertion:
innervation:
action:
- encased in: rectus sheath formed by aponeurosis of 3 pairs of anterolateral abdominal muscles
- divided by: tendinous inscriptions
- origin: pubis
- insertion: xiphoid process & costal cartilages 5-7
- innervation: thoraco-abdominal nerves
- action: flexes trunk, comresses abdominal viscera
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Muscle: external abdominal obliques (most superficial of the 3 anterolateral abdominal wall muscles)
Where is the inquinal ligament?
origin:
insertion:
innervation:
action:
- origin: external surfaces of 5-12 ribs
- insertion: linea alba, pubic tubercle, ant. half of iliac crest
- innervation: thoraco-abdominal nerves (ant. rami T7-T11) & subcostal nerve
- action: compress & support abdominal viscera; flex & rotate trunk
- Q: infer edge of each muscle from ASIS to pubic tubercle
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Muscle: internal abdominal obliques (next deep layer to the external of the 3 anterolateral abdominal wall muscles)
fibers?
origin:
insertion:
innervation:
action:
fibers: run perpendicular to thos of the external oblique, they vary along the length of the muscle.
origin: spine via thoracocolumbar fascia, ant. 2/3 of iliac crest, connective tissue dep to the inguinal ligament
insertion: inferior borders of 10-12 ribs, linea alba, and pubis via conjoint tendon
innervation: thoraco-abdominal nerves (ant. rami T7-T11) and first lumbar nerve
action: compress and support abdominal viscera; flex and rotate trunk
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Muscle: transversus abdominis (deepest of anterolateral abdominal wall muscles)
origin:
insertion:
innervation:
action:
origin: post. to thoracocolumbar fascia, internal surfaces of 7-12 costal cartilages, iliac crest, connective tissue deep to inquinal lig.
insertion: linea alba w/ aponeurosis of internal oblique, pubic crest, and pectin pubis via conjoint tendon
innervation: thoraco-abdominal nerves (ant. rami of T7-T11) and first lumbar nerve
action: compression and support abdominal viscera
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