Quantitative shape analysis of the deltoid tuberosity of modern humans (Homo sapiens) and common chimpanzees (Pan troglodytes)

Gómez, Mònica; Casado, Aroa; Diego, Marina de; Arias-Martorell, Júlia; Pastor, Juan Francisco; Potau, Josep Maria

doi:10.1016/j.aanat.2020.151505

Cited by 6 publications

(6 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The higher solicitation of the Pectoralis and wrist flexors/extensors typical of PH is likely due to the manipulation of large-sized stones (mean weight = 3 kg) with both hands. Both Deltoideus and Triceps brachii showed very minimal activity in the present study despite their probable functions in humanlike manipulation [3,85,86]. Nevertheless, the low contribution of those muscles could be explained by the fact that the expert mostly solicited the heads of those muscles that were not monitored by the electrodes.…”

Section: Muscle Demandscontrasting

confidence: 55%

Biomechanical demands of percussive techniques in the context of early stone toolmaking

Macchi

Daver

Brenet

et al. 2021

J. R. Soc. Interface.

View full text Add to dashboard Cite

Recent discoveries in archaeology and palaeoanthropology highlight that stone tool knapping could have emerged first within the genera Australopithecus or Kenyanthropus rather than Homo . To explore the implications of this hypothesis determining the physical demands and motor control needed for performing the percussive movements during the oldest stone toolmaking technology (i.e. Lomekwian) would help. We analysed the joint angle patterns and muscle activity of a knapping expert using three stone tool replication techniques: unipolar flaking on the passive hammer (PH), bipolar (BP) flaking on the anvil, and multidirectional and multifacial flaking with free hand (FH). PH presents high levels of activity for Biceps brachii and wrist extensors and flexors. By contrast, BP and FH are characterized by high solicitation of forearm pronation. The synergy analyses depict a high muscular and kinematic coordination. Whereas the muscle pattern is very close between the techniques, the kinematic pattern is more variable, especially for PH. FH displays better muscle coordination and conversely lesser joint angle coordination. These observations suggest that the transition from anvil and hammer to freehand knapping techniques in early hominins would have been made possible by the acquisition of a behavioural repertoire producing an evolutionary advantage that gradually would have been beneficial for stone tool production.

show abstract

Section: Muscle Demandscontrasting

confidence: 55%

Biomechanical demands of percussive techniques in the context of early stone toolmaking

Macchi

Daver

Brenet

et al. 2021

J. R. Soc. Interface.

View full text Add to dashboard Cite

show abstract

“…Changes in ratios along the shaft may be a reflection of an increase in humeral values more than a decrease in femoral values between the 35% ROI on the one hand and the 50% and 65% ROIs on the other hand (e.g., see trends in Figures S1‐S3). One potential explanation for the observed pattern along diaphyses may be the presence of the deltoid insertion, which spans parts of the proximal and lateral surface of the great ape humerus (see Gómez et al, 2020 ). The most prominent area of the diaphyseal attachment site is typically the most distal portion of the attachment, which often coincides with the midshaft region in great ape humeri (Swindler & Wood, 1973 ).…”

Section: Discussionmentioning

confidence: 99%

Ape femoral‐humeral rigidities and arboreal locomotion

Sarringhaus

Lewton

Iqbal

et al. 2022

American Journal of Biological Anthropology

View full text Add to dashboard Cite

Objectives This study investigates patterns of bone functional adaptations in extant apes through comparing hindlimb to forelimb bone rigidity ratios in groups with varying levels of arboreality. Materials and Methods Using CT scans, bone rigidity (J) was calculated at three regions of interest (ROI) along femoral and humeral diaphyses in Homo, Pongo, Pan, and Gorilla with further comparisons made between species and subspecies divisions within Pan and Gorilla. Results Consistent with previous work on extant hominoids, species exhibited differences in midshaft femoral to humeral (F/H) rigidity ratios. Results of the present study confirm that these midshaft differences extend to 35% and 65% diaphyseal ROIs. Modern humans, exhibiting larger ratios, and orangutans, exhibiting smaller ratios, bracketed the intermediate African apes in comparisons. Within some African apes, limb rigidity ratios varied significantly between taxonomic groups. Eastern gorillas exhibited the highest mean ratios and chimpanzees the lowest at all three ROIs. In posthoc comparisons, chimpanzees and bonobos did not differ in relative limb rigidity ratios at any of the three ROIs. However, western gorillas were more similar to bonobos than eastern gorillas at 50% and 35% ROIs, but not at the 65% ROI. Conclusion Species, and to a lesser extent subspecies, can be distinguished by F/H limb rigidity ratios according to broad positional behavior patterns at multiple regions of interest along the diaphyses. Similarity of bonobos and western gorillas is in line with behavioral data of bonobos being the most terrestrial of Pan species, and western gorillas the most arboreal of the Gorilla groups.

show abstract

“…The scapula of the large flying fox is in the dorsal area and has a craniocaudal elongation, while that in quadrupedal mammals is in the lateral part of the body. Similar to that of humans (Homo sapiens) and chimpanzees (Pan troglodytes), the scapula that is located in the dorsal position enhances the mobility of the scapulohumeral joint to facilitates complex locomotions such as vertical climbing and brachiation (Gómez et al 2020), and wing flapping in the large flying fox. The location of this bone in the dorsal area is an adaptation that enables the rotational motion of the caput humeri and supports the adduction and abduction movement of the arm and wings.…”

Section: Thoracic Girdle Arms and Wing Bonesmentioning

confidence: 99%

Musculoskeletal structure of the shoulder and arm in large flying fox (Pteropus vampyrus)

et al. 2022

View full text Add to dashboard Cite

Abstract. Cahyadi DD, Nurhidayat, Nisa’ C, Supratikno, Novelina S, Setijanto H, Agungpriyono S. 2022. Musculoskeletal structure of the shoulder and arm in large flying fox (Pteropus vampyrus). Biodiversitas 23: 5902-5913. The flight activity of bats is the most energy-consuming activity compared to other locomotion activities. The anatomical characteristic of its musculoskeletal system is believed to play important role in their flight ability. The present study aimed to describe the musculoskeletal morphology of the shoulder, arms, and wing of the large flying fox (Pteropus vampyrus). In this study, the parameters used are observing the specific body parts of the shoulder and arm skeletons and muscles, comparing skeletons and muscles of the other species of bats and related literature. The arm and wing skeleton of the large flying fox were relatively simple, lengthened, and flexible at the distal end of the distal most phalanx, demonstrating the flexibility of a flying fox’s arm and wing during flight. The muscles involved in flying movement that moved the wings, either in adduction or in abduction. The muscles that play a role in the wing adduction phase of the large flying fox are musculi (mm.) pectorales, musculus (m.) serratus ventralis thoracis, m. clavodeltoideus, and m. biceps brachii caput coracoideus. Conversely, the wing abduction phase is played by several main muscles, such as m. clavotrapezius, m. acromiotrapezius, m. latissimus dorsi, m. teres major, m. acromiodeltoideus, m. spinodeltoideus, m. triceps brachii caput laterale, and m. triceps brachii caput longum. Briefly, the musculoskeletal characteristics of the shoulder and arms of the large flying fox are suggested as morphological adaptation to allow free shoulder area movement, reduce the body mass, and resist the large torsional stress in the wing.

show abstract

Quantitative shape analysis of the deltoid tuberosity of modern humans (Homo sapiens) and common chimpanzees (Pan troglodytes)

Cited by 6 publications

References 34 publications

Biomechanical demands of percussive techniques in the context of early stone toolmaking

Biomechanical demands of percussive techniques in the context of early stone toolmaking

Ape femoral‐humeral rigidities and arboreal locomotion

Musculoskeletal structure of the shoulder and arm in large flying fox (Pteropus vampyrus)

Contact Info

Product

Resources

About