🤩IDENTIFICATION: Trunk and Lower Back Muscles

diaphragm: expand thoracic cavity, inferiorly compress abdominal viscera

external intercostals: elevate and protract ribs

internal intercostals: depress and retract ribs (in forced expiration)

transversersus thoracis: depress ribs

serratus posterior superior: elevate ribs (underneith the romboid muscles)

serratus posterior inferior: Depress ribs

longissimus dorsi (of erector spinae): extend, hyperextended trunk

quadratus lumborum: extend, laterally flex trunk

rectus abdominis: flex trunk

external oblique: superiorly compress abdominal contents in forced expiration, contralateral rotation of waist

internal oblique: superiorly compress abdominal contents in forced expiration, ipslateral rotation of waist

transverse abdomins: superiorly compress abdominal contents in forced expiration