Arrectores pilorum muscle (Figure 5 & 6) was prominent.
1) Multiple piloleiomyomas-both arising from arrectores pilorum muscle
2) Solitary piloleiomyomas-both arising from arrectores pilorum muscle
Regan, 1911; Chardon, 1968; Roberts, 1973; Lundberg, 1975; Howes, 1983ab; Fink & Fink, 1981, 1996; Arratia, 1987; Schaefer, 1990; Mo, 1991; Arratia, 1992; De Pinna, 1993, 1998; Diogo, 2004) but others seemingly constitute additional potential synapomorphies to diagnose the order, such as: arrector dorsalis not subdivided into different sections (22: 1 [right arrow] 0); frontal and autopterotic not contacting in dorsal view (48: 0 [right arrow] 1); absence of 'ligament between posttemporal and posterior margin of neurocranium' (92: 0 [right arrow] 1); presence of coracoid bridge (103: 0 [right arrow] 1); adductor mandibulae attaching exclusively on mandible and/or primordial ligament, near its mandibular insertion (111: 1 [right arrow] 0).
Significant part of mesial portion of arrector ventralis.
Each hair is attached to small muscles called arrector
Pilar leiomyoma arises from arrector pili, whereas genital leiomyoma arises from genital smooth muscle.
B, The lesions are composed of bundles or fascicles of smooth muscle cells mimicking arrector pili muscles (hematoxylin-eosin, original magnification X100).
In FUE, the extraction of the intact follicular unit is dependent on the principle that the area of attachment of arrector
muscle to the follicular unit is the tightest zone.
Slow-cycling cells of the hair follicle were found by Taylor and colleagues to be exclusively confined to a previously ignored area called the bulge, with that part of the outer root sheath marking the lowest point of the upper, permanent portion of the follicle, as well as the attachment site of the arrector
Infiltration of the arrector
pili muscle is also a frequent occurrence (Figure 5).
and control valves are discussed in Section C-7.